奄奄一息

yǎnyǎnyīxī
  1. dying
  2. at one's last gasp

CEDICT

dying; breathe one's last breath

Wiktionary

仅存微弱的一口气，形容生命或事物已到了最后时刻

維基詞典

Entry Composition

1 奄奄 yǎnyǎn
  1. (ideophonic) breathing feebly
  2. breathing feebly
2 一息 yīxī
  1. (literary, figuratively) in one breath; in a short moment
  2. (literary, figuratively) to have a rest
  3. (literary, literally) one breath
  4. in one breath; in a short moment
  5. one breath
  6. to have a rest

Related entries

垂死 chuísǐ dying
有着火的汽车和垂死的人，而且没有人能帮得上忙。

There were cars burning, people dying, and nobody could help them.

Source: Tatoeba

临危 línwēi
  1. dying (from illness)
  2. facing death
  3. on one's deathbed
不行了 bùxíngle
  1. (coll.) on the point of death
  2. dying
他买一把刀行，我买就不行了吗？

If it's okay for him to buy a knife, then why on earth can't I?

Source: Tatoeba

气绝 qìjué
  1. to take one's last breath
  2. dying