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1. To provide someone or something with the items, equipment, furnishings, etc., necessary to do or serve as something. A noun or pronoun can be used between "fit" and "up." The coach knew it was my first year playing hockey, so he fit me up with the other gear I needed. We'd like to fit up the extra room upstairs to make it into an office.
2. To falsely incriminate someone for some crime or wrongdoing; to frame or set up someone. A noun or pronoun can be used between "fit" and "up." He had always maintained that the police had fitted him up, but no one believed him. The gang is known to fit up innocent people to take the fall for their crimes.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
fit someone or something up (with something)and fit someone or something (up) with something
to provide someone or something with something for a particular purpose. We fit the couple up with fins, masks, and snorkels for skin diving. The clerk fitted up the couple with diving gear for their vacation. She fit them with tanks and weights.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.