poisons the well

Attacks source first

Poisons the well is a rhetorical tactic of preemptively discrediting a source or argument before it can be heard: Before she could even speak, he poisoned the well by calling her a known liar.

The metaphor suggests contaminating a water source so no one will drink from it—making an audience distrust information regardless of its merits.

Related

spin · loaded language · false dilemma · undermining · slippery slope · moving the goalposts · scapegoating · dog-whistle politics · gaslighting · prejudicial · projection · dirty tactics · fearmongering · discredit · red herring · appeal to authority · cherry-picking · tone policing

Opposites
rhetorical fairness and good faith

poisons the wellvouches for

Attests to someone's character

builds up

Family

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Familiarity
Top 500,000
Profile
Used worldwide · Timeless · Negative · Rated PG