stretch (verb)

to make your body or your arms and legs straight so that they are as long as possible, in order to exercise the joints (= place where two bones are connected) after you have been in the same place or position for a long time
"ooh big stretch", they said while looking at the cat who just woke up.

stretch (idiom)

to make a claim that is not completely true, or to do something that goes further than what is considered to be reasonable
"not sure about what your point is there, I think it's a stretch", they said unconvinced.