▪ cause (something, especially something undesirable) to happen sooner than it otherwise would:"this tragedy probably hastened his own death from heart disease"Similarspeed upmake fasteracceleratequickenprecipitateexpediteadvancehurry onstep uppush forwardurge onspur onfacilitateaidassisthelpboostinformal:crank upgee upOppositedelayslow down
Word Originmid 16th century: extended form of haste, on the pattern of verbs in -en1.