seal verb

1 close sth

ADV. carefully, firmly, properly, tightly, well The containers must be carefully sealed so that no air can get in. | completely, totally The unit is completely sealed. | virtually | effectively | hermetically a hermetically sealed container | off, up

PREP. from The nuclear plant would be effectively sealed off from the world. | with He sealed the bag tightly with sticky tape.

2 show formally that sth is agreed

ADV. formally

PHRASES be signed and sealed The contracts are already signed and sealed.