Question

That seems like a stretch, but it's not. Meaning

Answer 1

a bit of a stretch  :

A mild exaggeration beyond the truth or what is likely the case.

Answer 2

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Its' a stretch is an expression used to describe an unlikely achievement. It is a sarcastic comment often used to insinuate that one would need to stretch their imagination to believe what one is being told, or that the teller stretched his imagination to come up with the claim.