n. A pole or perch upon which fowls rest at night; any place upon which a bird may perch to rest; also, a locality where birds, as pigeons, habitually spend the night.n. Hence A temporary abiding- or resting-place.n. The fowls which occupy such a roost, collectively.n. The inner roof of a cottage, composed of spars reaching from one wall to the other; a garret. Jamieson. [Scotch.]To occupy a roost; perch, as a bird.To stick or stay upon a resting-place; cling or adhere to a rest, as a limpet on a rock.To set or perch, as a bird on a roost: used reflexively.See roust.