The first thing I would do is remove the screen/aerator from the faucet and check for dirt - that is its job. If clogged, clean and reinstall. If that is not the problem, go further south and check your shut off valve - it may be clogged. It has to be one or the other since its neighbor sink is running fine. It should be an easy fix. Also, if you have a flex supply line, make sure it did not kink up for some reason.