SAT GRE TOEFL onus Definition A burden or responsibility for something. Example "The onus is on the defense to prove the accused's innocence." Sign in to save SAT Quiz → GRE Quiz → TOEFL Quiz → ← onslaught ooze → Study tips featuring "onus" Let the Argument Reveal Unfamiliar Word Meanings Group Words Together by Emotional Tone Map Each Word Into a Connected Network Related words SAT antonym SAT abase SAT abdicate SAT abdomen SAT abduction SAT abet SAT abeyance SAT abject SAT abjure SAT ablution SAT abnegate SAT abnormal