BE AT THE END OF ONE'S TETHER (OR N. AMER. ROPE)
Meaning of BE AT THE END OF ONE'S TETHER (OR N. AMER. ROPE) in English
be at the end of one's tether ( or N. Amer. rope)
have no patience or energy left.
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Concise Oxford English vocab.
Сжатый оксфордский словарь английского языка.
2004