strike up with
[美]偶然碰见(某人)
不一定是交朋友的意思,只是碰到了一个人（一个能跟你谈得来的人）.
交朋友就是make friends...其他的词组不常用的.
meet friends
meet new people (it's a bit of a stretch...don't use it)
make acquaintance
become friends
become allies (not a common way of saying it）
好像就这些了.