Adjoin (4)

I believe the answer is:

abut

'adjoin' is the definition.
(abutting is a kind of adjoining)

This is the entire clue.

(Other definitions for abut that I've seen before include "Touch, lean on" , "Neighbour" , "Adjoin, touch" , "Adjoin at one end" , "Be next to -- share a boundary" .)

I've seen this clue in The Wall Street Journal, The Mirror, The Star Tribune, the Penny Press, the Evening Standard, The Guardian and The Telegraph.

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