Share a border with (4)

I believe the answer is:

'share a border with' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for abut that I've seen before include "Touch, lean on" , "Adjoin, touch" , "Adjoin at one end" , "Neighbour" , "Lie adjacent to" .)

I've seen this clue in the Newsday, the LA Times, the Universal, The Washington Post, The Wall Street Journal, the USA Today, The Mirror and The New York Times.

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