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 Mirror, the Universal, The New York Times, The Washington Post, the USA Today, the LA Times and The Wall Street Journal.

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