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on

adverb (CONNECTED)
 
 
/ɒn/ US  /ɑːn/

Definition

A2 on your body or someone's body: It's very cold so put a jumper on. She wanders round the house with nothing on. Can you remember what he had on (= was wearing)? I tried on a few jackets, but none of them looked nice.On or off covering the surface of something or connected to something: Screw the lid on tightly. Make sure the top's on properly. Surgeons managed to sew the finger back on.On or off
(Definition of on adverb (CONNECTED) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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