declare null and void; make ineffective; "Cancel the election results"; "strike down a law"
postpone indefinitely or annul something that was scheduled; "Call off the engagement"; "cancel the dinner party"; "we had to scrub our vacation plans"; "scratch that meeting--the chair is ill"
make up for; "His skills offset his opponent's superior strength"
make a counterattack and return like for like, especially evil for evil; "The Empire strikes back"; "The Giants struck back and won the opener"; "The Israeli army retaliated for the Hamas bombing"
give to a charity or good cause; "I donated blood to the Red Cross for the victims of the earthquake"; "donate money to the orphanage"; "She donates to her favorite charity every month"