鉴戒

鑒戒
jiànjiè
  1. lesson from events of the past
  2. warning

CEDICT

to take as a lesson; to serve as a warning

Wiktionary

警惕。

重編國語辭典

Entry Composition

=1 鉴 jiàn variant of 鉴 jiàn
=1 鉴 jiàn old variant of 鉴 jiàn
=1 鉴 jiàn
  1. bronze mirror (used in ancient times)
  2. to reflect
  3. to mirror
  4. sth that serves as a warning or a lesson
  5. to examine
  6. to scrutinize
=1 鉴 jiàn variant of 鉴 jiàn
2 戒 jiè
  1. to guard against
  2. to exhort
  3. to admonish or warn
  4. to give up or stop doing sth
  5. Buddhist monastic discipline
  6. ring (for a finger)

Related entries

预警 yùjǐng
  1. warning
  2. early warning
警示 jǐngshì
  1. to warn
  2. to alert
  3. warning
  4. cautionary
警报 jǐngbào
  1. (fire) alarm
  2. alert signal
  3. alarm
  4. alert
  5. warning
火警警报响了。

The fire alarm rang.

Source: Tatoeba