垫底

墊底
diàndǐ
  1. to put sth on the bottom
  2. to eat sth to tide oneself over until mealtime
  3. to lay the foundation
  4. to come last in the rankings

CEDICT

Entry Composition

1 垫 diàn
  1. pad
  2. cushion
  3. mat
  4. to pad out
  5. to fill a gap
  6. to pay for sb
  7. to advance (money)
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 底数 dǐshù)