Sheet-anchor meaning

(nautical) A large, spare anchor used in an emergency.
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(by extension) A source of help in times of danger.
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A large extra anchor intended for use in an emergency.
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A source of aid in time of emergency or danger.
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The heaviest anchor on a sailing ship, located amidships and used in emergencies.
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A person or thing to be relied upon in danger.
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(cricket) A batsman who provides dependable defence while a series of other batsmen score rapidly.
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