[f. BORE v.1 + -ING2.]
1. That bores or perforates; esp. applied to certain insects and mollusks.
1853. De la Beche, Geol. Observ., xxvi. 485. There were bare patches of carboniferous limestone in the sea, and into these the boring animals of the time burrowed.
1878. Huxley, Physiogr., 208. The perforations in the column of the temple are the work of boring shell-fish.
2. Of a horse: That thrusts his head forward.
1875. Stonehenge, Brit. Sports, II. III. i. § 3. 523. In every way, therefore, it acts well with a boring horse.