v.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.