Meaning of “(let's) say” in the English Dictionary

british dictionary

"(let's) say" in British English

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(let's) say

used to introduce a suggestion or possible example of something:

Try and finish the work by, let's say, Friday.
Say/Let's say (= if we accept) (that) the journey takes three hours, then you'd be there by two o'clock.

(Definition of “(let's) say” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)