What is meaning for un dos tres in spanish?

"Un dos tres" in Spanish literally means one two three. It's the equivalent of "one, two, three" in English.

However, it has various uses beyond just counting:

* Starting a countdown: Like in English, it can be used to start a countdown, for example, "Un, dos, tres... ¡ya!" (One, two, three... go!)

* Rhythm and timing: It can be used to set a rhythm or timing, like in a dance or a game.

* Emphasis or excitement: Sometimes it's used to emphasize a point or add excitement to a statement. For example, "Un, dos, tres... ¡vamos a la fiesta!" (One, two, three... let's go to the party!)

So, the meaning of "un dos tres" depends on the context.