Definition of sheet anchor
1
: a large strong anchor formerly carried in the waist of a ship and used as a spare in an emergency
2
: something that constitutes a main support or dependence especially in danger
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“Sheet anchor.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sheet%20anchor. Accessed 19 Jan. 2022.
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Time Traveler for sheet anchor
The first known use of sheet anchor was in 1626
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