onto Meaning in the Cambridge English Dictionary
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Meaning of “onto” in the English Dictionary

"onto" in British English

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ontopreposition

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

onto preposition (MOVEMENT)

B1 used to show ​movement into or on a ​particularplace: 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?

onto preposition (HOLDING)

hold, hang, grip, etc. onto to ​keepholding something: Hold onto my ​hand and you'll be ​perfectlysafe.

onto preposition (KNOWING)

knowing about someone or something that can be ​useful to you: You're onto a good thing with this buy-one-get-one-free ​deal.UK David put me onto (= told me about) a really good ​restaurant. knowing about something ​bad someone has done: He ​knows we're onto him.UK 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 ​unioncommittee. I've been having ​problemsloading this ​software onto my ​computer.
(Definition of onto from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"onto" in American English

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ontopreposition

 us   /ˈɔn·tə, ˈɑn-, -tu/
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 ​informationrelating 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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