onto (also on to) /ˈɒntuː/ preposition
MOVING › used to show movement into or on a particular place: The sheep were loaded onto trucks. Can you get back onto the path?
hold/grip, etc onto sth › to hold something: Hold onto my hand before we cross the road.
TALKING › used to show that you are starting to talk about a different subject: Can we move onto the next item on the agenda?
be onto sb › to know that someone has done something wrong or illegal: She knows we're onto her and she's trying to get away. Who put the police onto (= told the police about) her?
be onto sth › to know or discover something useful or important: Researchers think they may be onto something big. Can you put me onto (= tell me about) a good dentist?