比不上

bǐbùshàng
can't compare with

CEDICT

Entry Composition

1 比 bǐ
  1. to compare
  2. (followed by a noun and adjective) more {adj.} than {noun}
  3. ratio
  4. to gesture
  5. (Taiwan pr. bì in some compounds derived from Classical Chinese)
2 不 bù
  1. no; not so
  2. (bound form) not; un-
3 上 shàng
  1. (bound form) up; upper; above; previous
  2. first (of multiple parts)
  3. to climb; to get onto; to go up
  4. to attend (class or university)
  5. (directional complement) up
  6. (noun suffix) on; above