nullify

1 ENTRIES FOUND:
nullify /ˈnʌləˌfaɪ/ verb
nullifies; nullified; nullifying
nullify
/ˈnʌləˌfaɪ/
verb
nullifies; nullified; nullifying
Britannica Dictionary definition of NULLIFY
[+ object]
1 
: to make (something) legally null
2 
: to cause (something) to lose its value or to have no effect