let’s /lets/ BrE AmE
the short form of ‘let us’, used especially to make suggestions:
Let’s go!
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GRAMMAR
Let's is used to suggest in a fairly firm way that you and someone else should do something together, and is usually used when you think the other person will agree:
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Let's go somewhere different tonight.
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Let's start by introducing ourselves.
► Do not forget the apostrophe:
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Let's go (NOT Lets go).
► To make a negative suggestion, do not say 'let's don't'. Say let's not :
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Let's not tell anyone about this.
Speakers of British English also sometimes say don't let's :
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Don't let's argue.