guard-pilen. a pile placed as a protection in front of a quay or other structure; a fender or fender-pile (cf. sense 16i).
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1739 C. LabelyeShort Acct. Piers Westm. Bridge 19 The Use of these Fenders, or Guard-Piles, was to secure the Works from the approach of Barges, and other large Vessels.