sustain - verb

• lengthen or extend in duration or space
• undergo (as of injuries and illnesses)
• provide with nourishment
• supply with necessities and support
• be the physical support of; carry the weight of
• admit as valid
• establish or strengthen as with new evidence or facts

sustain - thesaurus

affirm   confirm   corroborate   get   have   hold   keep   maintain   nourish   nurture   prolong   substantiate   suffer   support