"hunting high and low"

What does "hunting high and low" mean?

Thank you.
Valeriy

Looking or searching everywhere.

Another phrase pops up in my head: "I went through them all [drawers, presumably], top to bottom."
SS

Thank you. I am not a hunter, but to my mind the origin of "hunting high and low" lies in hunting behaviour of various hunting dogs' breeds: some of them smell the game high (that is, pointing the nose up and intaking the air), the others put the nose close to the ground smelling the track.

To people who actually use the phrase, it means what RRC has indicated.
SS