verb/skwa.te.ʁi.ze/
to squat, to illegally occupy a place
“Ils squattérisent des terres gouvernementales et ce avec une agressivité telle que la police a peur d'entrer dans certaines zones.” — They are squatting on government land, and are so aggressive that the police are scared to go into certain areas.
From squatter + -iser, the verb was coined due to the fact that squatter tends to have the general meaning of "to be".