plant a/the seed of doubt (in someone's mind)

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plant a/the seed of doubt (in someone's mind)

To cause someone to have doubts, worries, or concerns (about something); to introduce someone to a doubtful or worrisome idea. The candidate was doing very well in the polls six months ago, but it seems that this smear campaign has been effective in planting a seed of doubt in the minds of voters. Recent economic turbulence in the Eurozone has planted the seed of doubt about the strength of the economy's recovery. Every time you act suspiciously like that, it plants a seed of doubt in my mind about your fidelity.
See also: doubt, of, plant, seed
References in periodicals archive ?
Callanan's 53rd minute goal planted the seed of doubt in Galway minds and with Noel McGrath superb, Tipp were unstoppable in front of 18,467 spectators.
That will be in the mind of Hughes ahead of next week because Harmison has planted the seed of doubt now which England should capitalise on.