杞人之忧

杞人之憂
Qǐrénzhīyōu
  1. lit. the fear held by a man of 杞 Qǐ that the sky would fall (idiom)
  2. fig. groundless fears

CEDICT

Entry Composition

1 杞 Qǐ
  1. Qi, a Zhou Dynasty vassal state
  2. surname Qi
2 人 rén person; people

classifiers: 個, 位
3 之 zhī
  1. (possessive particle, literary equivalent of 的 de)
  2. him
  3. her
  4. it
4 忧 yōu
  1. to worry
  2. to concern oneself with
  3. worried
  4. anxiety
  5. sorrow
  6. (literary) to observe mourning