Touch something that's blown over (4)

I believe the answer is:

abut

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'touch' is the definition.
(abutting is a kind of touching)

I don't understand how the rest of the clue works.

(Other definitions for abut that I've seen before include "Adjoin -- 19 (rev)" , "Touch upon" , "End or lean against, say a building" , "Adjoin at one end" , "Be next door to" .)

I've seen this clue in The Times.

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