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to nullify
01
to legally invalidate an agreement, decision, etc.
02
make ineffective by counterbalancing the effect of
03
to counteract or neutralize the intended or anticipated effect of something
Example
Stricter background checks for guns may nullify some mass shooters' ability to obtain firearms legally.
Changes in consumer behavior nullified forecasted increases in demand for certain products.
Increased awareness about the dangers of smoking helped nullify big tobacco's marketing campaigns aimed at youth.
