Definitions

1. noun

a foul or an act of fouling in sports, especially in rugby or ice hockey.

“The referee called a fou against the player who tripped the opponent.”

2. noun

the fouling of a pipe or channel with debris or sediment.

“The engineer had to clean out the fou from the drainage pipe.”

3. verb

to foul or make something foul, especially in sports.

“The player fouled the ball and gave away possession.”

4. verb

to clog or obstruct something, especially a pipe or channel.

“The sediment fouled the water filter and needed to be cleaned.”