WordNet sense 1 (get off (a horse)):

dismount, light, unhorse, get down

WordNet sense 2 (get out of quickly):

hop out

WordNet sense 3 (send via the postal service):

mail

WordNet sense 4 (transfer):

send

WordNet sense 5 (get high, stoned, or drugged):

trip, turn on, trip out

WordNet sense 6 (escape potentially unpleasant consequences; get away with a forbidden action):

escape, get by, get out, get away