Meanings
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1
contraction
used before a verb to suggest that the speaker and one or more other people do something
Let's take the earlier train tomorrow.
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2
contraction
used before a verb in instructions or encouragement addressed to a group
Let's look at the evidence one step at a time.
Thesaurus
Etymology
A contraction of let us. The construction developed from the imperative let followed by an object pronoun and became the ordinary English way to make a first-person plural suggestion or exhortation.