Can I say "Let's go" instead of "Let's roll"?
Yes, in this case, "let's roll" has the same meaning as "let's go", so you can replace that here. However, the nuance of "let's roll" is a bit different than "let's go". "Let's roll" is more of a colloquial, slang expression, and implies that you want to get out of somewhere or go somewhere quickly. Ex: We'd better hurry if we want to make it to the movie on time. Let's roll!
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