plug

noun

an object used to stop up a hole, gap, outlet, etc.
a natural concretion or formation that stops up a passage, duct, etc.
a small wedge or segment cut from something, as from a melon to test its ripeness
1. a cake of pressed tobacco
2. a piece of chewing tobacco
an electrical connector, as with projecting prongs, designed to be fitted into an outlet, etc., thus making contact or closing a circuit
a kind of fishing lure
1. spark plug
2. fireplug
3. ☆ plug hat
Informal a defective or shopworn article
☆ Slang an old, worn-out horse
☆ Informal a boost, advertisement, etc., esp. one inserted gratuitously in the noncommercial parts of a radio or TV program, magazine article, etc. for someone or something
Geol. igneous rock which has filled in the vent of a dead volcano and hardened: it is often exposed by erosion

transitive verb plugged, plugging

to stop up or fill (a hole, gap, etc.) by inserting a plug: often with up
to insert a plug of (something) in a hole or gap
☆ to cut a plug from (a melon) to test its ripeness
Informal
1. to publicize or boost (a song) by frequent performance
2. ☆ to advertise or publicize, esp. gratuitously in the noncommercial parts of a radio or TV program
Slang to shoot a bullet into
Slang to hit with the fist

intransitive verb