of considerable size or extent

her big hazel eyes

big buildings

big staff cuts

of considerable importance or seriousness

it's a big decision

his biggest problem is money

he made a big mistake

generous

‘I'm inclined to take pity on you.’ ‘That's big of you!’

the major league in a professional sport

the day he made it to the bigs, he forgot every minor league ballpark he ever played in

praise or recommend something highly

the record's been on the streets a while now, but it's still worth bigging up