turning the tide

Verb

turn the tide (third-person singular simple present turns the tide, present participle turning the tide, simple past and past participle turned the tide)

1. (idiomatic) To undergo a change or reversal of a general trend.
   • The general who turned the tide at Alamein was not, prior to his arrival in the Middle East, one of the very "top brass"; but he was a soldier, not a detergent manufacturer.1962 February, “No Talent on the Railways?”, in Modern Railways, page 74