I. ˈswak noun
( -s )
Etymology: Middle English (Scots) swak, of imitative origin
chiefly Scotland : a hard blow : whack
II. adjective
Etymology: Low German swak supple, pliant, weak, from Middle Low German; akin to Middle Dutch swac pliant, Middle Low German swacken to rock, reel — more at swag
chiefly Scotland : lithe , nimble