seal
US /siːl/
UK /siːl/

1.
2.
3.
a carnivorous marine mammal with flippers, a streamlined body, and a layer of blubber, able to live on land and in water
:
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We saw a seal basking on the rocks.
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Seals are excellent swimmers.
1.
2.
formally certify or approve (something)
:
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The deal was sealed with a handshake.
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Their fate was sealed when the enemy attacked.