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English definition of “onto”

onto

preposition (ASKING) (also on to)     /ˈɒn.tu/ US  /ˈɑːn.tu/ UK
If you are onto someone, you talk to that person , especially to ask them to do something, or to complain to them: I must get onto the plumber about the shower . Dad was onto her again about doing her homework .Lecturing and addressing Grammar:On, ontoOn and onto are prepositions.
(Definition of onto preposition (ASKING) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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