snowball

escalate heighten intensify multiply proliferate swell widen

advance aggrandize aggravate amplify annex augment boost broaden build burgeon deepen develop dilate distend double enhance enlarge exaggerate expand extend further grow inflate lengthen magnify mount pad progress prolong protract pullulate raise redouble reinforce rise sharpen soar spread strengthen supplement swarm teem thicken triple upsurge wax

build up run up slap on step up tack on

decrease lessen lower weaken

abbreviate abridge compress condense contract curtail cut decline deflate degrade depress diminish discourage drop fall hinder hurt minimize narrow recede reduce retreat retrogress shorten shrink slump subtract take back undermine