We've lost water pressure at the kitchen faucet. What should we do?

Remove aerator, run water for few moments w/o aerator, clean aerator, reinstall it - and let me know if it worked.

Aerator is the small screen attachment on tip of your faucet spout.

Good advice from Milo. BTW, folks often say they lost pressure but in fact what they have lost is volume. That areator could be clogged and knocks down your volume by 50%. If you find debris in the aerator carefuklly inspect it and tell us what you see. We might be able to diagnois the cause.