trust smb. as far as one can fling a bull by the tail

разг.

(trust smb. as far as one can fling (или throw) a bull by the tail)

совершенно, ни на йоту не доверять кому-л

Your own client has now stated that he considers Pete Sims an awful liar; that he wouldn't trust him as far as he could throw a bull by the tail... (E. S. Gardner, ‘The Case of the Drowsy Mosquito’, ch. 15) — Ваш собственный клиент заявил, что он считает Пита Симса отъявленным лгуном, что он ему ни на йоту не доверяет.