say it: suh-STAYN
sustain is a verb meaning "lengthen or extend in duration or space". It carries 7 recorded senses.
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”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for sustain come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.