Real Dictionary

evacuate
verb: If people evacuate a place, they move out of it for a period of time, especially because it is dangerous.
verb: To evacuate someone means to send them to a place of safety, away from a dangerous building, town, or area.

evacuate in American English
to make empty; remove the contents of; specif., to remove air from so as to make a vacuum
to withdraw, as from a besieged town or area of danger
intransitive verb: to leave a place because of military or other threats
transitive verb: to leave empty; vacate

evacuate in British English
to withdraw or cause to withdraw from (a place of danger) to a place of greater safety