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fit (one) up
To give one the necessary items or equipment to do something. The coach knew it was my first year playing hockey, so he fit me up with the other gear I needed.
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.