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THE ENGLISH DICTIONARY

English English

CEFR LEVEL

3335 entries have no recorded CEFR level and are included in All.

285 words & expressions

On the up and up

idiom

Legitimate, honest, and strictly adhering to ethical standards

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On the Warpath

idiom

Extremely angry, aggressive, and actively looking for a fight or confrontation

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on the way

phrase A1

traveling toward a destination; arriving soon; in the course of traveling toward a destination; along the route

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on the whole

phrase

Considering everything in general; taking all aspects into account

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on thin ice

idiom

In a precarious, fragile, or risky position where any misstep could lead to disaster

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on time

phrase A1

punctual; according to the expected schedule; not late; not late; arriving or happening at the arranged time

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On Top of the World

idiom

Feeling ecstatic, jubilant, and immensely proud or successful

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on track

idiom A2

proceeding, developing, or progressing smoothly according to plan

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on trial

phrase B2

being tried in a court of law, or undergoing a test period; Being tested or sampled before a final decision or formal purchase is made

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onboard

word A1

to welcome and integrate a new employee or client

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once

word A1

one time; as soon as something happens one time only; at some time in the past; formerly on one occasion only; at a time in the past

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Once and for All

idiom

Permanently, decisively, and finally resolving an ongoing dispute or problem

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Once Bitten, Twice Shy

proverb

A bad or painful experience makes a person cautious and self-protective against repeated harm

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Once in a Blue Moon

idiom

Very rarely; occurring on extremely infrequent occasions.

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Once in a lifetime

phrase

an exceptionally rare, monumental, or unique experience unlikely to happen again

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once in a while

phrase

Sometimes, but not frequently; on rare occasions

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once upon a time

phrase

A long time ago; at an earlier period in the past

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one

word A1

the number 1, or a single person or thing the number equivalent to the sum of zero and one; a single person or thing

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one by one

phrase A1

separately and in order, one after another

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One Fell Swoop

idiom

In a single sudden, decisive action or devastating stroke.

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one million

phrase A2

the number 1,000,000; ten lakhs

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one more

phrase A1

an additional one; one extra thing or person

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one more day

phrase B1

a single additional day of time

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one more time

phrase A2

once again; another single repetition

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one reason

phrase A1

a single cause or explanation for something

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One-Trick Pony

idiom

A person, group, or strategy with only one special skill, trick, or area of competence.

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onerous

word C1

Involving a great deal of effort, difficulty, or burdensome responsibility.

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onion

word A2

a swollen edible bulb with a pungent taste and smell, composed of several concentric layers; a round vegetable with a strong taste and smell, made up of many layers a round vegetable with a strong smell and flavor, usually used in cooking

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online

word A2

connected to or done through the internet connected to or available through the internet

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only

word A1

no more than; just one or just this without others; solely; without others; solely

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only human

phrase A2

having natural human weaknesses and likely to make mistakes

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only if

phrase A1

on the condition that and not otherwise

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only then

phrase A1

at that specific time and not before

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only when

phrase A1

not before the moment that something happens

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only you

phrase A1

no one else besides you; you alone

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onomatopoeia

word C2

the formation of a word from a sound associated with what is named

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opaque

word B2

Not able to be seen through; not transparent, or hard to understand.

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open

word A1

allowing access, passage, or view; not closed or locked; not closed; to make something not closed or available to move something so as to allow access; to begin to move something so that it is no longer closed; not closed; to move something so as to allow access; to begin to move something so that it is no longer closed; not closed

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Open a Can of Worms

idiom

To uncover a complicated and troublesome situation that leads to endless unforeseen problems.

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open the door

idiom A1

to create opportunities or possibilities for advancement

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