verbs
lengthen or extend in duration or space
"We sustained the diplomatic negotiations as long as possible"; "prolong the treatment of the patient"; "keep up the good work"
undergo (as of injuries and illnesses)
"She suffered a fracture in the accident"; "He had an insulin shock after eating three candy bars"; "She got a bruise on her leg"; "He got his arm broken in the scuffle"
provide with nourishment
"We sustained ourselves on bread and water"; "This kind of food is not nourishing for young children"
supply with necessities and support
"She alone sustained her family"; "The money will sustain our good cause"; "There's little to earn and many to keep"
be the physical support of; carry the weight of
"The beam holds up the roof"; "He supported me with one hand while I balanced on the beam"; "What's holding that mirror?"
admit as valid
"The court sustained the motion"
is a type of (narrower)
declare to be true or admit the existence or reality or truth of
"He admitted his errors"; "She acknowledged that she might have forgotten"
establish or strengthen as with new evidence or facts
"his story confirmed my doubts"; "The evidence supports the defendant"