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Webster 1913 Edition

Noun.

[F. See

(Mil.)

A hollow way, adapted to cover troops, and facilitate their aproach to a place.

Farrow.

Noun.

In the military art, a hollow way or natural hollow, adapted to cover troops and facilitate their approach to a place.

cavin ‎(plural cavins)

(military) A hollow route, adapted to cover troops and facilitate their approach to a place.
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