ASSAIL v.
tack by words, hostile influence, etc.; as, to assail one with appeals, arguments, abuse, ridicule, and the like. The papal authority . . . assailed. Hallam. They assailed him with keen invective; they assailed him with still keener irony. Macaulay.
BACK n.
daylight. Chaucer. Behind one's back, when one is absent; without one's knowledge; as, to ridicule a person behind his back. -- Full back, Half back, Quarter back (Football), players stationed behind those in the front line. -- To be or lie on one's back, to be helpless. -- To put, or get, one's back up, to assume a…