sheet anchor(redirected from sheet anchors)
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1. Nautical A large extra anchor intended for use in an emergency.
2. A source of aid in time of emergency or danger.
1. (Nautical Terms) nautical a large strong anchor for use in emergency
2. a person or thing to be relied upon in an emergency
[C17: from earlier shute anker, from shoot (obsolete) the sheet of a sail]