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English definition of “onto”

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onto

preposition uk ( also on to)   /ˈɒn.tu/ us    /ˈɑːn.tu/

onto preposition (MOVEMENT)

B1 used to show movement into or on a particular place: I slipped as I stepped onto the platform. The sheep were loaded onto trucks.
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onto preposition (CHANGING SUBJECT)

B2 used about changing to, or starting to talk about, a different subject: How did we get onto this subject? Can we move onto the next item on the agenda? I'd now like to come onto my next point.

onto preposition (HOLDING)

hold, hang, grip, etc. onto to keep holding something: Hold onto my hand and you'll be perfectly safe.

onto preposition (KNOWING)

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. knowing about something bad someone has done: He knows we're onto him. Who put the police onto (= told the police about) her?

onto preposition (ASKING)

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.

onto preposition (ADDING)

used about someone or something that is added to or joins a particular thing: Imir's been voted onto the union committee. I've been having problems loading this software onto my computer.
(Definition of onto from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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