/ˌʌn·dərˈkʌt/v[T](present participleundercutting, past tense and past participleundercut)
Definition
›to weaken, damage, or cause the failure of something; undermine: He's got a plan, so I don't want to undercut the effort that he has underway.›To undercut is also to charge less than a competitor: Large supermarkets can undercut their smaller rivals.