Plural of guzzler: multiple people who drink heavily, or multiple vehicles that use a lot of fuel.
Simple plural formation of 'guzzler,' adding the standard English '-s' ending. Both meanings (people and vehicles) coexist in modern English, with 'gas guzzlers' being the most common usage today.
You'll rarely hear someone call a person a 'guzzler' anymore, but 'gas guzzlers' is everywhere—this shows how slang meanings fade away while new compound words take on a life of their own as society changes what it cares about.
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