What is the meaning of sur un in French?

"Sur un" in French means "on a" or "on one". It is a preposition followed by a masculine singular noun.

Here are some examples:

* Sur un banc: on a bench

* Sur un livre: on a book

* Sur un nuage: on a cloud

* Sur un chemin: on a path

Note: "Sur un" is often used with verbs of motion, such as "marcher" (to walk), "courir" (to run), "s'asseoir" (to sit down), etc.

Here are some examples in context:

* Elle s'est assise sur un banc. (She sat down on a bench.)

* Le chien a couru sur un chemin. (The dog ran on a path.)

* Il a écrit sur un morceau de papier. (He wrote on a piece of paper.)

As you can see, "sur un" is a versatile preposition that can be used in many different ways.