HONK

Set to 8 different clues across 8 published puzzles, most often “Toot one's horn” — The New York Times, Sunday, 30 March 2008.

4 letters

Every clue on record, most used first

Toot one's hornonce
The New York Times — Sunday, 30 March 2008
Signal to a road hogonce
The New York Times — Tuesday, 1 August 2006
What taxis doonce
The New York Times — Thursday, 20 March 2003
"___ if you ..." (bumper sticker)once
The New York Times — Monday, 25 March 2002
Bumper sticker starteronce
The New York Times — Sunday, 4 April 1999
Goose soundonce
The New York Times — Sunday, 14 March 1999
Sign of impatienceonce
The New York Times — Sunday, 15 June 1997
It means "Out of my way!"once
The New York Times — Sunday, 18 May 1997