Pronunciation: /sil ʌp/
noun a marine mammal that lives in the water and on land
A1 I used a seal up to close the envelope tightly.
A2 The seal up on the container kept the food fresh for a long time.
B1 Make sure to use a seal up to prevent any leaks in the packaging.
B2 The seal up on the door was broken, allowing cold air to enter the room.
C1 The seal up around the window needed to be replaced to improve insulation.
C2 The seal up on the submarine hatch needed to be checked regularly for any signs of damage.
verb to close or block off a place or opening tightly
A1 Please seal up the envelope before you mail it.
A2 I need to seal up this box before I can ship it.
B1 The contractor will seal up the cracks in the wall to prevent leaks.
B2 After the investigation, the police will seal up the evidence for safekeeping.
C1 The government decided to seal up the documents to protect classified information.
C2 The scientist sealed up the research findings in a secure vault to prevent leaks.
formal The documents were sealed up in an airtight container for safekeeping.
informal I sealed up the package with tape before sending it out.
slang I told him to seal up his mouth and stop spreading rumors.
figurative She tried to seal up her emotions, but they eventually overflowed.
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