B1
to be the right size or shape for someone or something
Dictionary examples:
My cat thinks he fits in a shoebox. Spoiler: he doesn't. (0.0)
I tried to fit into my old jeans. Now I'm stuck. (0.0)
I can't fit into my skinny jeans. Time for pizza pants! (0.0)
These jeans don't fit me any more. (16.2)
That jacket fits you perfectly. (24.3)
I can't find a lid to fit this jar. (35.1)