学习中文的朋友，你知道“发小”是什么意思吗？

maybe it is a difficult question.发小，fa(4)xiao(3) means an intimate friend who is as old as you. you got up together from very little kids.you were  neighbours or lived nearby. you went to the same school even in the same class.although both of you could not get together since you had jobs,you are still the intimate friends.he/she likes your brother/sister in a same family.when you want to introduce him/her to others you could say:这是我的发小 or 我们是发小。yes. do you have one?

有一些区别。例如：普通话的邻居（neighbor），北京话叫街坊；普通话说一个人死心眼（stubborn），北京话叫轴，说一个人只能干些琐碎小事（a man doing trifles)，北京话把这种人叫碎催等等。在发音上也有些区别，普通话字正腔圆，北京话有些卷舌含混。

能学懂俚语，那不是一般的厉害了，个人觉得没必要学这么偏