LET'S


Meaning of LET'S in English

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:

Let's go somewhere different tonight.

Let's start by introducing ourselves.

► Do not forget the apostrophe:

Let's go (NOT Lets go).

► To make a negative suggestion, do not say 'let's don't'. Say let's not :

Let's not tell anyone about this.

Speakers of British English also sometimes say don't let's :

Don't let's argue.

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.