| plug | (noun) an old or over-worked horse | Synonyms: hack, jade, nag |
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| (noun) blockage consisting of an object designed to fill a hole tightly | Synonyms: stopper, stopple |
| (noun) an upright hydrant for drawing water to use in fighting a fire | Synonyms: fire hydrant, fireplug |
| (noun) electrical device that fits into the cylinder head of an internal-combustion engine and ignites the gas by means of an electric spark | Synonyms: spark plug, sparking plug |
| (noun) an electrical device with two or three pins that is inserted in a socket to make an electrical connection | Synonyms: male plug |
| (noun) blatant or sensational promotion | Synonyms: ballyhoo, hoopla, hype |
| (noun) a wad of something chewable as tobacco | Synonyms: chaw, chew, cud, quid, wad |
| plugboard | (noun) telephone central where circuits are completed with patchcords | Synonyms: patchboard, switchboard |
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| plugger | (noun) someone who is an active supporter and advocate | Synonyms: booster, promoter |
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| plughole | (noun) a hole into which a plug fits (especially a hole where water drains away) | - |
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