obturate

verb (used with object), ob·tu·rat·ed, ob·tu·rat·ing.

1. to stop up; close.
2. Ordnance. to close (a hole or cavity) so as to prevent a flow of gas through it, especially the escape of explosive gas from a gun tube during firing.

verb

1. (tr) to stop up (an opening, esp the breech of a gun)

v.

1. To close or obstruct.