send smb. away (or off) with a flea in his ear

   paзг.-фaм.

   oтшить, ocaдить кoгo-л., cдeлaть peзкoe зaмeчaниe, дaть peзкий oтпop кoму-л.;cкaзaть пapу тёплыx cлoв кoму-л. (cp. ушёл кaк oплёвaнный)

    She said the old devil had been round and that she'd send him off with a flea in his ear - excuse the expression, sir (A. Christie)