婚前張開眼，婚後半閉眼。

Keep your eyes wide open before marriage, half shut afterwards.

Source: Tatoeba

Sentence Composition

1 婚前 hūnqián
  1. premarital
  2. prenuptial
2 張開 zhāngkāi
  1. to open up
  2. to spread
  3. to extend
3 眼 yǎn
  1. (often used with 一 yī) a look; a glance
  2. small hole
  3. (bound form) salient point
  4. classifier for wells, cave-dwellings etc

classifiers: 隻, 雙
4 婚後 hūnhòu
  1. (attributive) postnuptial; postmarital
  2. after marriage
  3. postnuptial; postmarital
5 半 bàn
  1. half
  2. semi-
  3. incomplete
  4. (after a number) and a half
6 閉眼 bìyǎn
  1. (figuratively) to die
  2. to close the eyes
  3. to die
  4. to pretend not to see