初伏

chūfú
the first of the three annual periods of hot weather (三伏 sānfú), which typically begins in mid-July and lasts 10 days

CEDICT

夏季最热的前十天。参见「三伏」条。

重編國語辭典

Entry Composition

1 初 chū
  1. at first
  2. (at the) beginning
  3. first
  4. junior
  5. basic
2 伏 fú
  1. to lean over
  2. to fall (go down)
  3. to hide (in ambush)
  4. to conceal oneself
  5. to lie low
  6. hottest days of summer
  7. to submit
  8. to concede defeat
  9. to overcome
  10. to subdue
  11. volt