noun

• (now uncommon) A hollow in a rock; a cave or cavern.
• (architecture) A concave vault or archway, especially the arch of a ceiling.
• (US) A strip of prairie extending into woodland.
• (Cumbria) A recess or sheltered area on the slopes of a mountain.

verb

• (architecture) To arch over; to build in a hollow concave form; to make in the form of a cove.
  "The mosques and other buildings of the Arabians are rounded into domes and coved roofs."

noun

• (British, dated, informal, thieves' cant, Lewis) A fellow; a man.
  "Don’t call Major Pendennis an old cove, if you’ll ’ave the goodness, Lightfoot, and don’t call me an old cove, nether. Such words ain’t used in society; and we have lived in the fust society, both at ’ome and foring."
• (Australia and Polari) A friend; a mate.

verb

• (ambitransitive, obsolete) Of a bird or other animal: to brood, cover, incubate, or sit over (eggs).
  "Moreover, the provident care of the tortoiſe in the generation, nouriſhment and preſervation of [h]er yooung, is vvoonderfull: for out ſhe goeth of the ſea, and laieth her egges or caſteth her ſpavvne upon the banke ſide; but being not able to cove or ſit upon them, nor to remaine herſelfe upon the land out of the ſea any long time, ſhe beſtovveth them in the gravell, and aftervvards covereth them vvith the lighteſt and fineſt ſand ſhe can get: […]"