铰的

Ream \Ream\, v. t. [imp. & p. p. {Reamed} (r[=e]md); p. pr. &
vb. n. {Reaming}.] [Cf. G. r["a]umen to remove, to clear
away, fr. raum room. See {Room}.]
To bevel out, as the mouth of a hole in wood or metal; in
modern usage, to enlarge or dress out, as a hole, with a
reamer.