An archaic or dialect term meaning to soothe, calm, or put at ease; to allay.
From Middle English allaien, derived from Old French alaid, from Latin ad- 'to' + lassus 'tired/weary'. It's an alternative spelling of allay with similar pronunciation.
This word shows the rough spelling variation in Middle English—'aullay' and 'allay' meant the same thing, but printers and writers eventually standardized it to 'allay'!
Complete word intelligence in one call. Free tier — 50 lookups/day.