noun
a person or thing that you can depend on in a difficult situation
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WORD ORIGIN
late 15th cent.: perhaps related to obsolete shot , denoting two cables spliced together, later influenced by sheet sense 6.
SHEET ANCHOR
Meaning of SHEET ANCHOR in English
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005