Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “that's it”

that's it

B1 used to say that something has ended: Well, that's it, we've finished - we can go home now. That's it! I'm not putting up with any more of her rudeness.Expressions telling people to stop doing something B2 used to say that something is correct: You switch the computer on at the back. That's it.Words and phrases expressing agreement and acceptance Grammar:It, this and that in paragraphsWe use it, this and that to introduce further information about a topic already mentioned. However, the words have different uses.See moreGrammar:ThatThat is a very common word in both writing and speaking. We use it as a determiner, a demonstrative pronoun and a relative pronoun. We also use it as a conjunction to introduce that-clauses.See moreGrammar:That: determiner and pronounWe use that most commonly to point to a thing or person. We use it with singular nouns. The thing or person is often distant from the speaker and sometimes closer to the listener, or not visible to either the speaker or listener:See moreGrammar:That: relative pronounWe use that to introduce defining relative clauses. We can use that instead of who, whom or which to refer to people, animals and things. That is more informal than who or which:See moreGrammar:That-clausesWe also use that to introduce that-clauses after some verbs, adjectives and nouns:See moreGrammar:That: other usesSee moreGrammar:This, that, these, thoseThis, that, these and those are demonstratives. We use this, that, these and those to point to people and things. This and that are singular. These and those are plural. We use them as determiners and pronouns.See moreGrammar:This, that, these, those as determinersSee moreGrammar:This, that, these, those as pronounsSee moreGrammar:This and these, that and those: usesSee moreGrammar:Substitution with that, thoseIn formal contexts, we can use that and those as substitutes meaning ‘the one(s)’:See more
(Definition of that's it from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

Browse related topics

You are looking at an entry to do with Words & phrases expressing agreement & acceptance, but you might be interested in these topics from the Expressing agreement & support topic area:

Translations of “that's it”

Word of the Day

beneficiary

a person or group who receives money, advantages, etc. as a result of something else

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More