1. a lock attached to the sashes of a double hung window that can fix both in the shut position; [syn: sash fastener, sash lock, window lock]
WordNet (r) 3.0 (2006):
sash lock
n 1: a lock attached to the sashes of a double hung window that
can fix both in the shut position [syn: sash fastener,
sash lock, window lock]