Sustain  v. 1 support, bear the weight of, esp. For a long period. 2 encourage, support. 3 (of food) nourish. 4 endure, stand. 5 suffer (defeat or injury etc.). 6 (of a court etc.) Uphold or decide in favour of (an objection etc.). 7 corroborate (a statement or charge). 8 maintain (effort etc.).  sustainable adj. [latin sustineo keep up]