Water coming through at trickle - Washing Machines

Although you have not shared the make, model, and year, I will give it a try anyway.
Start by turning off the water at the faucets for the washer.
Then unhook the hose ( or both of them) and attach a garden hose to the faucet, and run the hose outside, or if that is not possible, run the hose to a sink or a shower or a tub, for the drain.
Turn on the water faucet and see if you get good pressure through the water hose.
If you do, then examine the black hoses from the faucets to the washer.
Often these have a tiny wire mesh filters inside the end or ends of them to filter the incoming water.
These can plug up with sediment, and you will need to clean them.
If they are clear, then examine the attachment on the back of the washer, where the hoses go.
These can also have tiny wire mesh filters inside, that can plug up with sediment.
Those screens can be removed and cleaned.
God bless your efforts.