膨大

péngdà
to swell; to inflate

CEDICT

to swell; to distend; to expand

Wiktionary

擴大。

重編國語辭典

胀大，扩大

維基詞典

Entry Composition

1 膨 péng swollen
2 大 dà
  1. big; large; great
  2. older (than another person)
  3. eldest (as in 大姐 dàjiě)
  4. greatly; freely; fully
  5. (dialect) father
  6. (dialect) uncle (father's brother)