1. noun
True, theres no harm in crying for ones husband, and the tombstone, though plain, was a solid piece of work, and on summers days when the widow brought her boys to stand there one felt kindly towards her.
b) The symbol "" marking the end of a proof.
2. verb
For a surfboard to stand upright half-submerged in the water (like a tombstone, above) because the surfer is underwater with his or her legrope pulled tight. Often this indicates a surfer in difficulty, either held down by the power of a wave or unconscious and unable to get to the surface.
Before the contest even started, Slater went down hard in a warmup session. He took a two-wave hold-down in the semifinals, his board tombstoning eerily for all to see,
Wikipedia foundation.