turn the tide

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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.
   • 1962 February, “No Talent on the Railways?”, in Modern Railways, page 74:

     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.

   • 2008 March 21, Owen Bowcott, “The man who captured the human cost of conflict”, in The Guardian:

     Images captured by the photojournalist Philip Jones Griffiths in Vietnam helped turn the tide of public opinion against the war.

• “turn the tide”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.