lozenge-coachn. a coach with the owner's coat of arms emblazoned on a lozenge (see 1b), a dowager's or widow's coach.Apparently an isolated use.
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1746 H. WalpoleLet. to H. Mann 21 Aug. I am retired hither like an old summer dowager; only that I have no toad-eater to take the air with me in the back part of my lozenge-coach.