Since your question is so vague (is it a shower, tub/shower, lavatory, kit. sink or laundry tub faucet) I'd have to say that the flow restrictor in the aerators or showerhead is clogged up. Just unscrew and remove and either clean aerator or sh.head out and/or remove flow restrictor permanently. If that doesn't work turn off water and disconnect supply tubes from faucet and run them into a bucket and turn water back on to check for volume. If you have plenty of water at supplies then remove faucet and take defective faucet back to where it was bought and get another one!
SOURCE: We installed two new single handle shower faucets
Sounds like the valve is defective. The supply to the stems was not bored out at the factory giving you a valve that is essentially pretty on the outside and solid on the inside. To test it, uninstall the valve. Remove the stems. Then try running a pipe cleaner though the valve from the supply side and see if it stops before the stem.
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