invalidate

in·val·i·date
UK: /ɪnvˈælɪdˌe‍ɪt/   US: /ˌɪnˈvæɫɪˌdeɪt/
sagnorð
  • ógilda, ónýta (to invalidate his evidence)

Samheiti: annul, avoid, cancel, nullify, quash, vitiate, void