past participle of go bad

Of foods and commodities, having become spoiled, rotten, or otherwise unusable due to age or storage conditions.

Of foods and commodities, to spoil, rot, or otherwise become unusable due to age or storage conditions.

unpleasant-smelling breath

(poker) The losing of a hand after being the mathematical favorite to win at the start of the hand.

The treatment of other people in an impolite or discourteous way, or incorrect behaviour in public.

(figuratively) Any advice or treatment that has no value or exacerbates the problem.

(idiomatic) A situation that is badly planned, or illogical.

Alternative spelling of badmouth

present participle of bad-mouth