: having done or discovered something important, special, etc. When the crowd responded to the show so positively, we realized we were onto something.

Is it onto something or on to something?

Onto is a preposition, it implies movement, and is more specific that on. On to are two words, and when paired with each other, on acts as a part of a verbal phrase and to acts as a preposition. You can quickly remember the different by saying “up” before on/onto.

What does it mean to be on something?

phrase. DEFINITIONS1. to take part in something that is being planned or discussed.