How to use
used to say that someone or something moves to a position on a surface, area, or object
She watched him walk onto the platform.
Don't jump onto
the bus while it's moving.
Pour the syrup on to the egg mixture.
The car rolled over onto its side.
down/out/up etc onto something
Let's get back onto the highway.
used to say that a room, door, or window faces towards something or allows movement into another place
The dining room looks out onto a pretty garden.
a gate leading on to a broad track
be onto somebody
get onto somebody
especially British English
to speak to someone in order to tell them or ask them something
A number of people have been onto me complaining about the noise.
Get onto the Press Office and find out what's happening.
to know that a particular person did something wrong or committed a crime
The police are onto him.
be onto something
to have discovered or produced something new and interesting
With the new show, we were onto something big.
be onto a good thing/a winner
I think she's onto a real winner with this song.
get onto something
to be dealing with something or start dealing with something
I'll get onto it right away.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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