To hold up; bear up; uphold; support.To hold suspended; keep from falling or sinking: as, a rope sustains a weight; to sustain one in the water.To keep from sinking in despondency; support.To maintain; keep up; especially, to keep alive; support; subsist; nourish: as, provisions to sustain a family or an army; food insufficient to sustain life.To support in any condition by aid; vindicate, comfort, assist, or relieve; favor.To endure without failing or yielding; bear up against; stand: as, able to sustain a shock.To suffer; have to submit to; bear; undergo.To admit or support as correct or valid; hold as well founded: as, the court sustained the action or suit.To support or maintain; establish by evidence; bear out; prove; confirm; make good; corroborate: as, such facts sustain the statement; the evidence is not sufficient to sustain the charge.In music, of tones, to prolong or hold to full time-value; render in a legato or sostenuto manner.See living.8 and To sanction, approve, ratify, justify.To sustain one's self; rest for support.To bear; endure; suffer.n. One who or that which upholds; a sustainer.