undercut
🇺🇸
/ˌʌndərˈkʌt/
🇬🇧
/ˌʌndəˈkʌt/
To sell goods at a lower price than competitors.
The new store undercut the prices of the other stores, making them very popular.
To weaken or diminish something.
The rumors tried to undercut the team's confidence, but they remained strong.