[V] to have air come suddenly and noisily out through your nose and mouth in a way that you cannot control, for example because you have a cold:
I've been sneezing all morning.
IDIOMS
not to be sneezed at (informal) good enough to be accepted or considered seriously:
In those days, $20 was not a sum to be sneezed at.
noun the act of sneezing or the noise you make when you sneeze:
coughs and sneezes * She gave a violent sneeze.
