Related Clues:

• Part of S.W.A.K.
• Slam, maybe
• Sealed
• Door position
• Kubrick's "Eyes Wide ___"
• Preventing passage
• Confined
• Locked
• Word with in, up or down
• Airtight
• Seal up
• Occlude
• Closed up
• Isolated, (with "off")
• Made airtight