Removal of the aerator does not help. No one touched the supply valves, the other faucets have normal flow, all pipes are copper. Flow was normal for the first year or two. This time of year the supply water is much colder than it has been, but well above freezing. Should I disassemble the faucet and look for anything? Some adjustment?
I apologize now that I see the question is ambiguous. The flow has already reduced, I am not hasing how to reduce it. Sorry!

my kitchen faucet has lost lot of pressure all of a sudden. I did clean the aerator twice…no luck. And do not have a side spray. the faucet is the kind that you push a button to make it spray also. the problem is with both hot and cold water. incidentally this all happened when one of our pipes sprang a leak. the rubber washer deteriorated on an pipe supply line in the garage (where the water comes in from outside) and we had that repaired immediately but the problem with the faucet started at the same time and still persists. The pressure everywhere else is still the same (as before the leak). So what i can’t figure out is what is the relationship between the leak and the kitchen faucet only. And why is the faucet still messed up after the leak was repaired. We have checked all the valves to make sure they are open all the way. Showers upstairs have same pressure as before. Bathroom sink and toilet on same level as kitchen are still functioning as before too. This one’s a mystery!