fit on

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fit on (something)

To attach or place something onto something else. A noun or pronoun can be used between "fit" and "on." I can't fit on these gloves—are you sure they're mine? You know, you can adjust that wrench if you can't fit it on the nut.
See also: fit, on

fit something on(to) something

 and fit something on
to manage to place something onto something. See if you can fit this lid onto that jar over there. Sorry, I can't fit on this lid, because it's too big.
See also: fit, on