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English definition of “-er”

-er

suffix (PERFORMER)    /r/ US  // (also -or)
added to some verbs to form nouns that refer to people or things that do that particular activity: a singer (= a person who sings) a swimmer (= a person who swims) a dishwasher (= a machine or person that washes dishes) an actor (= a person who acts)Acting and actsDealing with things or people
(Definition of -er suffix (PERFORMER) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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