Synonyms for Shut off:

n.

adrift, lonely, abandoned, friendless, isolated, forlorn, estranged, lonesome, alone, alienated. hold back, stamp out, squeeze out, suppress, cut into, interfere with, kill off. cut, deactivate, flash, disable, disengage, flip off, immobilize, cannibalize, flick. shut off (noun)
close off, block off.
turn off (noun)
discontinue, put a stop to, close.

Other synonyms:

cut into, cut, interfere with, squeeze out, hold back, suppress, stamp out, kill off. close. stop
put a stop to.
Other relevant words:
alone, isolated, alienated, disengage, estranged, discontinue, deactivate, suppress, cut, close.