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Use "lichened" in a sentence
"A rocky outcrop, lichened with peeling yellow and grey, jutted beside an overgrown hole, visible only from a certain angle."
"It lands on one of the boulders at the top of the shore, where the orange/buff of the breast and the patterning on the wings and back render it inconspicuous almost to the point of invisibility against the mottled and lichened rock."
"A stand of winter chestnuts round a set of farm buildings is 'very Badmin'; a row of swallows on a phone wire above a lichened tiled roof becomes a Tunnicliffe."