This is the 3499th most frequent French word.
dupuis
The correct spelling is "depuis," and it means "since" or "for" in English, indicating a point in time or duration.
Used as a preposition to denote a point of time starting from my arrival.
Depuis mon arrivée, tout a changé.
Since my arrival, everything has changed.
Used as a preposition to indicate the duration of time he has been living here.
Il habite ici depuis cinq ans.
He has lived here for five years.
Used as a conjunction introducing a subordinate clause indicating the point in time when she left.