on‧to S1 W2 ( also on to ) / ɒntə ; before vowels ɒntʊ ; strong ɒntu $ ɑn-, ɒn- / 介词

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.

down/out/up etc onto something

Let’s get back onto the highway.

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

3 be onto somebody informal

a) ( 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.

b) to know that a particular person did something wrong or committed a crime :

The police are onto him.

4 be onto something informal

a) 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.

b) ( also get onto something ) to be dealing with something or start dealing with something :

I’ll get onto it right away.