decrease volume

allay alleviate appease arrest becalm calm choke compose fix gag hush lull muffle muzzle pacify quiet quieten settle shush silence slack smooth soothe squash squelch stall stop subdue tranquilize

shut down shut up smooth over

advance aggravate agitate allow anger arouse destroy disarrange distress encourage excite help incite intensify irritate let go provoke release rouse start unsettle upset worry

disturb move