prep
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 sth
　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 sbinformal
a)alsoget onto sb
especially BrE 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.
be onto sthinformal
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)alsoget onto sth
to be dealing with something or start dealing with something
　I'll get onto it right away.