Answer:

sealup

Answer	Crossword Clue
SEALUP	Make hermetic
SEALUP	Make airtight
SEALUP	Close off, as a tomb

SEALUP	Close tightly
SEALUP	Shrink-wrap, e.g.
SEALUP	Shrink-wrap
SEALUP	Close securely
SEALUP	Make watertight, maybe
SEALUP	Close tight
SEALUP	Make watertight
SEALUP	Make airtight, maybe

SEALUP	"... your lips . . . ": Shak.
SEALUP	Thoroughly confine
SEALUP	Make airtight, perhaps
SEALUP	Shut tight

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.