To perforate with a trephine.
To use a trephine during surgery.
A surgical instrument with a cylindrical blade used to remove a circular section of tissue, f.e. bone or cornea; a trepan.
To expose the genitalia.
To remove one's hat or cap as a mark of respect.
To reveal the identity of.
To remove a cover from.
To show openly; to disclose; to reveal.
To expose (lines of formation of troops) successively by the wheeling to right or left of the lines in front.