a big brother (=older brother – used especially by or to children)
Jake was my big brother and I admired him.
a younger brother
Do you have any younger brothers?
a little brother (also a kid brother American English) (=younger brother)
My kid brother was always annoying me.
a baby brother (=brother who is still a baby)
Mum let me hold my new baby brother.
a twin brother
Luke and his twin brother Sam went everywhere together.
a half-brother (=brother with only one parent the same as yours)
I never really liked my half-brother.
a step-brother (=the son of your stepfather or stepmother)
His dad’s new wife brought him two step-brothers.
Examples from the Corpus
brother• His decision to send her away from her home and brother into an alien world was interpreted as rejection.• He was friend, father, brother, neighbor, lover.• Personally, I don't believe the allegations which are being made against him and his brother.• My brotherhangs out with people who beat people up as like a job.• It was not until March in 1782 that the brothers made the error that was the beginning of their undoing.• I have two brothers, James and Karl.• She remembers that people told them they looked alike, and they joked that they were brother and sister.• He came to the defense of his younger brother, Von, by swinging a chain at his attacker.
big brother• Vincente caddied for him for a while but it was an awkwardrole for a big brother.• Let the older child get as involved as possible and point out how much the new babyloves her big brother.• Stewart was deeply moved to be back in the compellingpresence of his big brother after five years.• First time my big brother comes to visit me in how many years has it been now?• When I told my big brother about the whole thing, he said I was bloodystupid.• My big brother Carl became the most utterly-spoiled and pampered child of all.• Michael's big brother is named Jonathan.• All my love, Your big brother Sam.
brother2 interjection especially American EnglishAmE
ADJECTIVE | PHRASESADJECTIVE➤big, elder, older兄長;哥哥◇Bill idolizes his big brother, who is a professional boxer.比爾非常崇拜他那當職業拳擊手的哥哥。➤baby, kid (informal) , little, small, younger尚在襁褓中的弟弟;小弟弟▸➤twin雙胞胎兄弟▸➤full (= sharing both parents)親兄弟▸➤beloved, much-loved心愛的兄弟◇She wrote daily to her beloved brother, Leo.她每天給親愛的弟弟利奧寫信。➤long-lost失散多年的兄弟◇His old teacher greeted him like a long-lost brother.他以前的老師就像對待失散多年的兄弟一樣迎接他。➤dead, deceased, late已故的兄弟◇He married the wife of his late brother.他娶了已故哥哥的妻子。➤bachelor, unmarried單身漢/未婚的兄弟PHRASES➤blood brothers (= close friends who have sworn to remain friends for life) , brother and sister結拜兄弟;兄弟姐妹◇Do you have any brothers and sisters?你有兄弟姐妹嗎?➤like brothers親如兄弟◇The boys are so close, they're like brothers.這些男孩子親密得像兄弟一般。