| lose strength(verb, expression, harm, hinder, spoil) |
| mar(verb, hurt, reduce, ruin, damage) |
| mess up(verb, expression, upset, hurt, ruin) |
| muck up(verb, expression, upset, hurt, ruin) |
| prejudice(verb, hurt, reduce, ruin, destroy) |
| queer(verb, harm, hinder, spoil, weaken) |
| rough up(verb, expression, harm, hinder, spoil) |
| tarnish(verb, hurt, reduce, ruin, destroy) |
| tweak(verb, harm, hinder, spoil, weaken) |
| vitiate(verb, hurt, reduce, ruin, destroy) |
| worsen(verb, harm, hinder, spoil, weaken) |
| X-out(invalidate, unstrengthen, disenable) |
| X out(expression, invalidate, unstrengthen, disenable) |
| blight(verb, ruin, damage, harm, spoil) |
| blot(verb, ruin, impair, blemish, blight) |
| blow sky-high(expression, invalidate, unstrengthen, disenable) |
| blow sky high(expression, idiom, invalidate, unstrengthen, disenable) |
| blunt(verb, harm, hinder, spoil, weaken) |
| bobble(quell, bollix, flubbed) |
| bollix(quell, flubbed) |