XXthe short form of 'let us', used especially to make suggestions:
SUGGESTIONS SUGGESTIONS Use let's to make a suggestion about something you and someone else could do together. Let's... is a fairly firm way to suggest something, 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'. Use let's not• Let's not tell anyone about this.• Let's not go out tonight.Speakers of British English also sometimes say don't let's• Don't let's argue.
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.
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