方寸不乱

方寸不亂
fāngcùnbùluàn

to remain calm and composed

Wiktionary

Entry Composition

1 方寸 fāngcùn
  1. square cun (Chinese unit of area: 1 cun × 1 cun, or 3⅓ cm × 3⅓ cm)
  2. heart
  3. mind
2 不 bù
  1. no; not so
  2. (bound form) not; un-
3 乱 luàn
  1. in confusion or disorder
  2. in a confused state of mind
  3. disorder
  4. upheaval
  5. riot
  6. illicit sexual relations
  7. to throw into disorder
  8. to mix up
  9. indiscriminate
  10. random
  11. arbitrary