<human>:  How do I repair a leaking pipe under the sink?
<bot>: First, you will need to shut off the water supply to the sink. Then, disconnect the current pipe and replace it with a new one. You may need to use plumber's tape or a putty material to seal the connection, depending on the type of pipe you have. Finally, turn the water supply back on and test the new pipe to make sure the leak is fixed.