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English definition of “onto”

onto

preposition  /ˈɔn·tə, ˈɑn-, -tu/ us  
into a position on: Gennaro tossed his newspaper onto the table. be onto To be onto something or someone is to be aware of other information relating to the situation, esp. when someone is trying to deceive you: Everybody is onto you – why don’t you admit you lied?
(Definition of onto from the Cambridge Academic Content Dictionary © Cambridge University Press)
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