"plugging" in the verb sense
1. plug, stop up, secure
fill or close tightly with or as if with a plug
"plug the hole"
"stop up the leak"
2. plug, plug away
persist in working hard
"Students must plug away at this problem"
3. punch, plug
deliver a quick blow to
"he punched me in the stomach"
4. plug
make a plug for praise the qualities or in order to sell or promote
5. plug
replace the center of a coin with a baser metal
"plug a nickle"
6. plug
insert a plug into
"plug the wall"
7. plug
insert as a plug
"She plugged a cork in the wine bottle"
Source: WordNet® (An amazing lexical database of English)
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