'Steam up' definitions:

Definition of 'Steam up'

From: GCIDE
  • Steam up \Steam` up"\ (st[=e]m` [u^]p"), v. t. To cause to be covered by a translucent layer of condensed water in fine droplets, such as by breathing on a cold window; to fog; as, to steam up one's eyeglasses. [PJC]

Synonyms of 'steam up'

From: Moby Thesaurus