seal up

phrasal verb·1 sense·particle up

Meanings

1

Close something completely so nothing can get in or out

Why “up”? Filling to the top. Reaching the upper limit means finishing.

They sealed up the cracks.
They closed up the cracks completely.
They sealed up the box with tape.
They closed the box completely with tape.

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They sealed up the cracks. What does it mean?

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