This is the 9253rd most frequent French word.
courez
"Courez" means "run" (imperative form of "courir" addressed to "vous").
In this sentence, 'courez' is the conjugation of the verb 'courir' in the present tense for the second person plural (you). It is used to talk about the action of running.
Vous courez plus vite que moi.
You run faster than me.
Here, 'courez' is used as an imperative form in the second person plural (you). It is a command urging someone to perform the action of running.
Courez chercher le médecin!
Run to get the doctor!
In this example, 'courez' is again the present tense second person plural (you) used in a subordinate clause indicating the action during running.