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English definition of “plug”

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plug

noun [C] uk   /plʌɡ/ us  

plug noun [C] (ELECTRICAL)

B1 a small plastic or rubber object with two or three metal pins, attached to the end of a wire on a piece of electrical equipment and pushed into a special opening in a wall to connect the equipment to a supply of electricity: a three-pin/two-pin plug to fit/change a plug If a plug is wired incorrectly, it can be dangerous. mainly UK informal an electric socket : Is there a plug in the bedroom that I can use for my hairdryer? US ( UK jack plug) a metal pin at the end of a long wire joined to a piece of electrical equipment and used to connect it to another piece of electrical equipment informal for spark plug
More examples

plug noun [C] (FOR HOLE)

B1 a small piece of rubber, plastic, wood, etc. that fits into a hole in order to close it
See also
B1 a round piece of rubber or plastic that fits into the hole in a sink or a bath: a bath plug Put the plug in the sink and run some water. a small piece of plastic or wood that you put into a hole in a wall before putting a screw into it a small piece of material such as cotton wool , twisted or pressed tightly so it is firm

plug noun [C] (ADVERTISEMENT)

the act of telling people publicly about a product, event, etc.: She never misses an opportunity to get in a plug for her new film.

plug

verb [T] uk   /plʌɡ/ (-gg-) us  

plug verb [T] (ADVERTISE)

to advertise something by talking about it a lot or praising it, especially on the radio or television: That interview was just a way for him to plug his new book. They're plugging this new chocolate bar everywhere at the moment.

plug verb [T] (SHOOT)

US slang to shoot someone with a gun: Sure, boss, we plugged the guy (full of lead).

plug verb [T] (FILL HOLE)

to fill a hole with a piece of suitable material: Have you plugged that leak (= stopped it by filling the hole) in the pipe? My nose was bleeding and I plugged it with cotton wool.
(Definition of plug from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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