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on‧to S1 W2 also on to

1 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 (=into) the bus while it's moving.
Pour the syrup on to the egg mixture.
The car rolled over onto its side.
She watched him walk onto the platform.
Don't jump onto (=into) the bus while it's moving.
Pour the syrup on to the egg mixture.
The car rolled over onto its side.2 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
The dining room looks out onto a pretty garden.
a gate leading on to a broad track3
be onto somebody
informala) also 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.
A number of people have been onto me complaining about the noise.
Get onto the Press Office and find out what's happening.b) to know that a particular person did something wrong or committed a crime :
The police are onto him.
The police are onto him.4
be onto something
informala) to have discovered or produced something new and interesting :
With the new show, we were onto something big.
With the new show, we were onto something big.b) also get onto something to be dealing with something or start dealing with something :
I'll get onto it right away.
I'll get onto it right away.