'Relieving arch' definitions:

Definition of 'Relieving arch'

From: GCIDE

Relieving \Re*liev"ing\, a. Serving or tending to relieve. [1913 Webster]
Relieving arch (Arch.), a discharging arch. See under Discharge, v. t.
Relieving tackle. (Naut.) (a) A temporary tackle attached to the tiller of a vessel during gales or an action, in case of accident to the tiller ropes. (b) A strong tackle from a wharf to a careened vessel, to prevent her from going over entirely, and to assist in righting her. --Totten. --Craig. [1913 Webster]