一面之缘

一面之缘:

Literally means:

met sb. once

Actually means:

nodding acquaintance; chance acquaintance

缘 refers to the chance or possibility of one person or thing being connected with another.

This phrase means having met once. It is a written expression.

缘，缘分，即人与人或人与物发生某种联系的可能性或机会。

一面之缘，见一面的缘分，表示曾经见过一次面。书面语。