big adj.
1 large
VERBS be, look, seem | become, get, grow
ADV. extremely, incredibly, really, very | fairly, pretty, quite, rather This house is rather big for us. We need something smaller.
PHRASES big fat He was a big fat chap with a beard.
2 important
VERBS be
ADV. extremely, really, very hoping the show would be a really big success | fairly, pretty This is a fairly big decision to make.
You can also check other dicts: big (English, 中文解释 ), wordnet sense, Collins Definition