反作用

fǎnzuòyòng
  1. (physics) reaction
  2. (fig.) backlash; unintended consequence

CEDICT

physics

Entry Composition

1 反 fǎn
  1. contrary
  2. in reverse
  3. inside out or upside down
  4. to reverse
  5. to return
  6. to oppose
  7. opposite
  8. against
  9. anti-
  10. to rebel
  11. to use analogy
  12. instead
  13. abbr. for 反切 fǎnqiè phonetic system
2 作用 zuòyòng
  1. to act on; to affect
  2. action; function; activity
  3. impact; result; effect
  4. purpose; intent
  5. (suffix) -ation, -tion etc, as in 抑制作用 yìzhìzuòyòng, inhibition