a toad under a hammer的用法和样例：
- a toad under a harrow
- Maybe the most sensible reason is, when aperson walks under a ladder, it may fall on him or her, or a hammer ora bucket of paint may fall on his or her head.
- The mason was chipping away at the rock with a hammer.
- The toad is already sleeping under a stone.
- The fox went to ground under a rocky escarpment.