Also found in: Dictionary.
plug something up
to stop or fill up a hole, crack, or gap. Take out the nail and plug the hole up with something. You have to plug up the cracks to keep out the cold.
1. To obstruct the path or passageway through, into, or out of something: An orange rind plugged up the sink. Leaves have plugged the storm drain up.
2. To be obstructed so that substances cannot pass through: The hose plugged up and eventually burst.
3. To cause the path through, into, or out of something to become obstructed: They plugged up the leaks in the boat with tar. We plugged the hole up with a cork.