to be sneezed at
not to be sneezed/sniffed at(informal)
1. if something, especially an amount of money, is not to be sneezed at, it is large enough to be worth having And there's the increase in salary to be considered. £3000 extra a year is not to be sneezed at.
2. if something or someone is not to be sneezed at, they are important or dangerous enough to deserve serious attention Goodman is not a man to be sniffed at. (American & Australian informal)
See also: sneeze