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onto

preposition (ASKING) (also on to)
 
 
/ˈɒn.tu/ US  /ˈɑːn.tu/ UK

Definition

If you are onto someone, you talk to them, 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
(Definition of onto preposition (ASKING) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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