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English definition of “on”

on

adverb (POSITION)    /ɒn/ US  /ɑːn/
used when talking about the position of one thing compared with the position of another: It's amazing nobody was injured because the two buses collided head on (= the front parts of the buses hit each other).UK The bike hit our car side on (= hit the side of the car rather than the front or back).UK It would be easier to get the bookcase through the doorway if we turned it sideways on (= turned it so that one of its sides is at the front).On or off Grammar:On, ontoOn and onto are prepositions.See more
(Definition of on adverb (POSITION) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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