一言僨事

一言偾事
yīyánfènshì

a single word can ruin things

Wiktionary

Entry Composition

1 一言 yīyán
  1. one sentence
  2. brief remark
2 僨事 fènshì
  1. (literary) to fail in something; to spoil something; to ruin something
  2. to fail in something; to spoil something; to ruin something