心无二用

心無二用
xīnwúèryòng
one cannot concentrate on two things at the same time

CEDICT

专心一致。《喻世明言．卷六．葛令公生遣弄珠儿》：「自古道心无二用，原来申徒泰一心对着那女子身上出神去了，这边呼唤，都听不得，也不知分付的是甚话。」也作「心无二想」。

重編國語辭典

Homographs

心无二用 xīnwú'èryòng

Entry Composition

1 心 xīn
  1. heart
  2. mind
  3. intention
  4. center
  5. core

classifiers: 顆, 個
2 无二 wú'èr
  1. (literary) to harbour no disloyalty; to be wholeheartedly faithful
  2. to harbour no disloyalty; to be wholeheartedly faithful
  3. to have no difference; to be identical
3 用 yòng
  1. to use; to make use of; to employ
  2. (coverb) with; using
  3. to need; to have to (usu. used in the negative or in questions)
  4. usefulness; utility
  5. (bound form) expense; outlay
  6. (courteous) to eat; to drink
  7. (literary) hence; therefore