('informal') She's a good musician but comparing her to the legends is 'stretching it'. [=she's good but she can't really be compared to the legends]
Although it may be 'stretching a point' [=exaggerating slightly] to say that this was his best win ever, it was nevertheless impressive.
He is clearly 'stretching' the rules in his favor. [=he is doing something that is not really allowed by the rules]