Wiktionary
blow horn
n. (alternative form of blowhorn English)
Wikipedia
Blow Horn
Blow Horn is an album by FJF (Free Jazz Four), a quartet formed by Swedish saxophonist Mats Gustafsson and American reedist Ken Vandermark with the Chicago's NRG Ensemble rhythm section of bassist Kent Kessler and drummer Steve Hunt. It was recorded in 1995 and released on Okka Disk.
Usage examples of "blow horn".
VEHICLE OPERATORS NOTICE STOP ENGINE SET BRAKES PUT OUT LIGHTS DON'T BLOW HORN DON'T SMOKE U.
NOTICE STOP ENGINE SET BRAKES PUT OUT LIGHTS DON'T BLOW HORN DON'T SMOKE U.