be onto
Intermediate (B1)informal
To know that something important is there, or to have figured out what someone is really up to.
"The scientists believe they're onto a new treatment that could change everything."
Hear it in context

We surprised the lads with the man who has the greatest name in world football… 😂🔥
That Peter Crouch Podcast · 1:09
You might be onto something.

Bold and the Beautiful - 2009 (S22 E175) FULL EPISODE 5576
The Bold and the Beautiful · 4:48
He may be onto us.

The Strangest Phenomena Ever Seen on Earth
Astrum Extra · 27:05
your senses might be onto something.

Let Them Be Wrong
Einzelgänger · 5:37
and therefore that they must be onto something.

The BEST Magicians That MYSTIFIED The Judges on Britain's Got Talent 2026!
Got Talent Global · 63:31
then you could be onto something really good, John.