1.lengthen or extend in duration or space;
We sustained the diplomatic negociations as long as possible
2.undergo (as of injuries and illnesses);
She suffered a fracture in the accident
3.provide with nourishment;
We sustained ourselves on bread and water
4.supply with necessities and support;
She alone sustained her family
5.be the physical support of; carry the weight of;
The beam holds up the roof
6.admit as valid;
The court sustained the motion
7.establish or strengthen as with new evidence or facts;
his story confirmed my doubts