LETMEIN
Set to 3 different clues across 3 published puzzles, most often "Open up!" — The New York Times, Thursday, 5 August 2010.
7 letters
Every clue on record, most used first
- "Open up!"once
The New York Times — Thursday, 5 August 2010
- Knocker's requestonce
The New York Times — Sunday, 10 August 2008
- What "knock knock" may meanonce
The New York Times — Thursday, 27 March 2008