verb (old).—‘An imitative word to express the sound with which coachmen encourage their horses (?), unless it is another form of yerk’ (DAVIES).
1606. T. DEKKER, The Seven Deadly Sinnes of London, iii. Candle lights coach … is drawne (with ease) by two rats: the coachman is a chaundler, who so sweats with YEACKING them, that he drops tallowe, and that feedes them as prouender.
