not to be sniffed at

not to be sniffed at

To not be something that should be ignored, passed over, dismissed, or treated with disdain; to not be trivial or inconsequential. We may not have won the game, but we scored enough points and caused enough damage to let everyone know we aren't to be sniffed at. Sure, a hundred bucks isn't a huge amount to win in a lottery, but it's still not to be sniffed at!
See also: not, sniff

not to be ˈsneezed/ˈsniffed at

(informal) important or worth having: If I were you, I’d take the job. A salary like that’s not to be sneezed at.
See also: not, sneeze, sniff