| become contaminated(expression, decline, weaken, lessen, degenerate) |
| become extinct(verb, expression, go, withdraw, abandon) |
| bland(adjective, insipidity) |
| blight(verb, break, decline, hurt, ruin) |
| blink(verb, shine, flicker, twinkle) |
| break down(verb, expression, phrasal verb, stop, break) |
| break up(verb, expression, decline, separate, fail) |
| breathe |
| calm down(expression, drop, cut, decline, reduce) |
| cave in(expression, fail, faint, wither, shrivel) |
| change color(expression, idiom) |
| check(verb, drop, quiet, cut, decline) |
| cloud(verb, dull, reduce, lower, obscure) |
| come to naught(expression, idiom, go, withdraw, leave) |
| commonplace |
| conk out(verb, expression, stop, break, fail) |
| cover |
| crack(harm, spoil, injure, deterioration) |
| curdle(verb, decline, weaken, lessen, degenerate) |
| curtail(verb, drop, quiet, cut, decline) |