sustain [ su·stain ]
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1. Strengthen or support physically or mentally.
Russian support sustains Europe's last dictatorship in Belarus.
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2. Bear (the weight of an object) without breaking or falling.
Their little wobbly legs barely sustaining their weight.
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3. Undergo or suffer (something unpleasant, especially an injury)
He sustained head injuries and a fractured skull.
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4. Cause to continue for an extended period or without interruption.
he cannot sustain a normal conversation
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5. (of a performer) represent (a part or character) convincingly.
Working with Marlene Kaminsky for In Absentia was, on the other hand, very difficult since it wasn't a role where you could sustain a character.
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6. Uphold, affirm, or confirm the justice or validity of.
In the absence of such evidence, a finding of discrimination could not be sustained.
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Noun
1. An effect or facility on a keyboard or electronic instrument whereby a note can be sustained after the key is released.
She has a decent voice, but it was her sustain on the more difficult notes that really impressed.
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Origin
1. Middle English from Old French soustenir, from Latin sustinere, from sub- ‘from below’ + tenere ‘hold’.

