偶一

ǒuyī
  1. accidentally
  2. once in a while
  3. very occasionally

CEDICT

Entry Composition

1 偶 ǒu
  1. accidental
  2. image
  3. pair
  4. mate
2 一 yī
  1. one
  2. single
  3. a (article)
  4. as soon as
  5. entire; whole; all; throughout
  6. "one" radical in Chinese characters (Kangxi radical 1)
  7. also pr. yāo for greater clarity when spelling out numbers digit by digit

Containing this entry

偶一為之 ǒuyīwéizhī
  1. to do sth once in a while (idiom)
  2. to do sth more as an exception than the rule

Related entries

無意中 wúyìzhōng
  1. accidentally
  2. unintentionally
  3. unexpectedly
母親無意中握住了椅子。

Unconsciously my mom took hold of the chair.

Source: Tatoeba

誤打誤撞 wùdǎwùzhuàng
  1. accidentally
  2. to act before thinking
失手 shīshǒu
  1. a slip
  2. miscalculation
  3. unwise move
  4. accidentally
  5. by mistake
  6. to lose control
  7. to be defeated
偶爾 ǒuěr
  1. occasionally
  2. once in a while
  3. sometimes
我偶尔做。

I seldom do that.

Source: Tatoeba

偶而 ǒuér
  1. occasionally
  2. once in a while