coign of vantage
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coign of vantagea favourable position for observation or action. literary
The literal sense of a coign of vantage is ‘a projecting corner of a wall or building’; the phrase appears in Shakespeare 's Macbeth in Duncan's description of the nesting places of the swifts at Macbeth's castle. The word quoin meaning ‘an external angle of a building’ still exists in English, but the archaic spelling coign survives mainly in this phrase.
See also: of