definition of
sustain

[1] #1 sustain v. [prolong, keep up] lengthen or extend in duration or space; "We sustained the diplomatic negotiations as long as possible"; "prolong the treatment of the patient"; "keep up the good work". wn

[2] #2 sustain v. [suffer, have, get] undergo (as of injuries and illnesses); "She suffered a fracture in the accident"; "He had an insulin shock after eating three candy bars"; "She got a bruise on her leg"; "He got his arm broken in the scuffle". wn

[3] #3 sustain v. [nourish, nurture] provide with nourishment; "We sustained ourselves on bread and water"; "This kind of food is not nourishing for young children". wn

[4] #4 sustain v. [keep, maintain] supply with necessities and support; "She alone sustained her family"; "The money will sustain our good cause"; "There's little to earn and many to keep". wn

[5] #5 sustain v. [hold, support, hold up] be the physical support of; carry the weight of; "The beam holds up the roof"; "He supported me with one hand while I balanced on the beam"; "What's holding that mirror?". wn