All 4 Uses

sustain
in
Into the Wild
(Edited)

He sustained a perfect 4.0 grade-point average through high school and college.
p. 73.9 *

sustained = maintained through time
"I had some terrific experiences in the wilderness since I wrote you last, overpowering, overwhelming," he gushed to his friend Cornel Tengel. "But then I am always being overwhelmed. I require it to sustain life."
p. 91.4

sustain = support
This, I figured, could sustain me for three or four more days if need be, but then what would I do?
p. 140.7 *

sustain = support (provide necessities for)
But built into his life is awareness of that presence, of the terrain, of the unpredictable weather, of the narrow margin by which he is sustained.
p. 184.3

sustained = supported

Definitions:

(1) (sustain as in: sustained by her faith)
provide support or necessities
(2) (sustain as in: sustained through the ages)
to continue through time
(3) (sustain as in: sustained wounds)
to suffer (as of injury, damage, or loss)
(4) (meaning too rare to warrant focus)
Less commonly, sustained can be voiced by a judge in a court of law to indicate that an objection is upheld.