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The acronym SEAL in the United States Navy SEALs stands for Sea, Air, and Land. It is derived from the teams' ability to operate on the seas, in the air, and on land.
A seal is something such as a piece of sticky paper or wax that is fixed to a container or door and must be broken before the container or door can be opened. The seal on the box broke when it fell from its hiding-place. [+ on] Protestors banged on the sides of the lorry and broke customs seals on the doors.