how would you say "turn the light off, or get off of the couch!"

For 'turning off' appliances, you would say 'etenn' or 'fèmen'.  Please check these links on Turning on / Turning off.

*Get off (to withdraw, to pull out, to go away)  → leve, soti, or retire kò w

Get off of the couch.
Leve sou kanape a. (Get up from the couch)
Soti sou kanape a. (Get away from the couch)
or
Retire kò w sou kanape (Remove your body from the couch.)


Get off of my lawn.
Soti sou gazon mwen an.
Retire kò'w sou gazon mwen an.


Get off of my property.
Soti sou pwopriyete mwen
Retire kò'w sou teren mwen




*Get off (as in to disembark, to settle, come down) → desann, rete
EXAMPLE:
Saying to a tap-tap driver:↓
Driver, I will get off right here.
Chofè, m'ap desann la a.


Get off of the tree, otherwise you might fall.
Desann pye bwa a, sinon ou ka tonbe.