WordNet sense 1 (lengthen or extend in duration or space):

prolong, keep up

WordNet sense 2 (be the physical support of; carry the weight of):

hold, support, hold up

WordNet sense 3 (provide with nourishment):

nourish, nurture

WordNet sense 4 (supply with necessities and support):

keep, maintain

WordNet sense 5 (establish or strengthen as with new evidence or facts):

affirm, confirm, corroborate, substantiate

WordNet sense 6 (undergo (as of injuries and illnesses)):

get, have, suffer, have