un·der·cut 
/ˌʌndɚˈkʌt/ verb
un·der·cuts; un·der·cut; un·der·cut·ting /ˌʌndɚˈkʌt/ verb [+ obj] 1 : to offer to sell things or work for a lower cost than (another person or company)
▪ They undercut the competing store by 10 percent. 2 : to make (something) weaker or less effective : undermine
▪ a law that undercuts the Constitution ▪ Her behavior undercuts her own credibility.
▪ They undercut the competing store by 10 percent.
▪ a law that undercuts the Constitution ▪ Her behavior undercuts her own credibility.
