flat nose; flat-nosed person
Refers to a nose that is flat or squashed, or a person with such a nose. Can be used descriptively or as a mild insult.
He has a flat nose, so his glasses tend to slip down.
Who is that flat-nosed man?
Compound of 鼻 (nose) and 潰れ (crushing, flattening), from the verb 潰れる (to be crushed). The exact historical derivation is uncertain, but the word directly describes a flattened nose.