Crossword Genius

Buttonhole, e.g (4)

Ross

I believe the answer is:

slit

(Other definitions for slit that I've seen before include "Narrow straight cut or opening" , "Narrow aperture" , "Long narrow opening" , "Long straight cut" , "Long narrow cut" .)

I've seen this clue in the LA Times, the Universal and the Newsday.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.