资料来源 : pyDict

免罚,释放,错过

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Let-off \Let"-off`\ (l[e^]t"[o^]f`; 115), n. (Mach.)
   A device for letting off, releasing, or giving forth, as the
   warp from the cylinder of a loom.