variant of WHIFT sb.
1644. True Narr. Seige Plymouth, 5. Having given a signe by hanging out a Wift, that he was in distresse.
1901. W. Clark Russell, Ships Adv., vii. Theres the barque that fouled us last night, sir. Shes got a wift at her mizzen-peak.
1905. Westm. Gaz., 16 June, 2/1. A wift of white foam.