sustain >> səˈsteɪn
Definition: [verb] strengthen or support physically or mentally.
Example: this thought had sustained him throughout the years
Definition: [verb] undergo or suffer (something unpleasant, especially an injury).
Example: he sustained severe head injuries
Definition: [verb] cause to continue for an extended period or without interruption.
Example: he cannot sustain a normal conversation
Definition: [verb] uphold, affirm, or confirm the justice or validity of.
Example: the allegations of discrimination were sustained
Definition: [noun] an effect or facility on a keyboard or electronic instrument whereby a note can be sustained after the key is released.