相逢

píng shuǐ xiāng féng

萍水相逢

have a casual, temporary meeting

yì dì xiāng féng

异地相逢

meet in a strange land

xiá lù xiāng féng

狭路相逢

be compressed into one's ever shrinking domain

dà yuē zhǐ guò le yī zhōu wǒ men yòu xiāng féng le

大约只过了一周我们又相逢了。

We met again only a week or so later.