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English definition of “onto”

onto

preposition (KNOWING) (also on to)     /ˈɒn.tu/ US  /ˈɑːn.tu/
knowing about someone or something that can be useful to you: So how did you get onto this deal? David put me onto (= told me about) a really good restaurant. You're onto a good thing with this buy-one-get-one-free offer at the shop.Aware knowing about something bad someone has done: He knows we're onto him. Who put the police onto (= told the police about) her?Aware Grammar:On, ontoOn and onto are prepositions.See more
(Definition of onto preposition (KNOWING) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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