Definition of "Sustain" :

verb: undergo (as of injuries and illnesses)

verb: establish or strengthen as with new evidence or facts

verb: admit as valid

"The court sustained the motion."

verb: supply with necessities and support

"She alone sustained her family."

verb: provide with nourishment

"We sustained ourselves on bread and water."

verb: be the physical support of; carry the weight of

verb: lengthen or extend in duration or space

"We sustained the diplomatic negotiations as long as possible."