weaken

[1]	debilitate , enfeeble , enervate , emasculate , mitigate , moderate , dilute , deplete , diminish , lessen , depress , lower , reduce , sap , undermine , exhaust , impoverish
[2]	fade , dwindle , tire , droop , sag , fail , give way , crumble , flag
[3]	give in , sabotage , undermine , relent , acquiesce , countermine , counteract , give way , yield , subvert , accede , consent , agree , assent , soften , bend , ease up , let up , ease off , relax
[4]	water (down) , de-escalate , step down , dilute , thin (out)
[5]	dampen , damp , soften , break