(intransitive, chiefly Scotland) To growl, especially like a dog; quarrel; to be captious or troublesome.
adjective
(UK dialectal) Sour; brackish.
adjective
(nautical, of a vessel, especially sailboat) Quick and agile; easy to hand, reef and steer.
1939, The Philadelphia Story written by Philip Barry
My, she was yar...It means, uh...easy to handle, quick to the helm, fast, right. Everything a boat should be, until she develops dry rot.
Arr, here be a fine vessel: the yarest river-going boat there be.