[pèng qiǎo]
by chance; by coincidence; happen to
There chanced to be someone there I knew.
在那里碰巧我有认识人。
I saw him yesterday, as it happens.; It so happened that I saw him yesterday.
碰巧我昨天看见了他。
I happened on just the thing I'd been looking for.
我碰巧找到了一直在找的东西。