杞人之忧

1. • the fear held by a man of 杞 qǐ that the sky would fall (idiom)

     lit.

2. • groundless fears

     fig.

Character by character

• 杞(qǐ)Qi, a Zhou Dynasty vassal state
• 人(rén)person
• 之(zhī)(possessive particle, literary equivalent of 的 de)
• 忧(yōu)worry