Low water pressure in a specific sink after turning off the supply lines
Many faucets have an aerator device and a wire mesh screen at the point where the water comes out. The piece is screwed on. If your faucet has something like this, remove it and check for debris. (Pay attention while disassembling: the order and direction of the parts matters with some designs.) The assembly uses a "normal" (right hand) thread, but often hard water deposits make it difficult to turn.