tight seal
Completely closed off
A tight seal is a closure that prevents air, liquid, or other substances from passing through.
The phrase emphasizes completeness—a seal that actually works: Make sure the lid forms a tight seal, The gasket creates a tight seal between the pipes.
Figuratively, keeping a tight seal means maintaining strict secrecy: They kept a tight seal on the investigation.
- airtightImpervious to atmosphere
- watertightPrevents liquid from passing
- hermeticImpenetrably closed off
- gasketMechanical leak preventer
- rubber gasketFlexible sealing ring
O-ring · vacuum · vacuum packed · leakproof · caulk · rubber · compress · press fit · lid · pop top · jar · mason jar · container · suction · pressure · snap · click · freshness