觸底

触底
chùdǐ
  1. (literally and figurative) to touch bottom; to reach the lowest point
  2. to touch bottom; to reach the lowest point

Wiktionary

Entry Composition

1 觸 chù
  1. to touch
  2. to make contact with sth
  3. to stir up sb's emotions
=2 底 de (equivalent to 的 as possessive particle)
=2 底 dǐ
  1. bottom; base
  2. background; foundation
  3. copy (of a manuscript or receipt etc) kept as a record
  4. (suffix) end of a year or month
  5. (math.) radix; base (abbr. for 底數 dǐshù)