This is the 9572nd most frequent French word.
démarquer
"To mark down" or "to differentiate."
In this sentence, 'démarquer' is used reflexively as 'se démarquer,' meaning 'to stand out' or 'distinguish oneself.'
Il a réussi à se démarquer parmi les autres candidats.
He managed to stand out among the other candidates.
Here, 'démarger' is mistakenly written instead of 'démarrer,' which correctly means 'to start.'
Elle a démarré l'ordinateur en appuyant sur le bouton.
She started the computer by pressing the button.
In this case, 'démarquer' is not involved; rather 'démarcher' meaning 'to canvass or solicit' is intended.