dare

(noun) a challenge to do something dangerous or foolhardy. Synonyms: daring. Example: "He could never refuse a dare."

(verb) take upon oneself; act presumptuously, without permission. Synonyms: make bold, presume. Example: "How dare you call my lawyer?."

(verb) to be courageous enough to try or do something. Example: "I don't dare call him", "she dares to dress differently from the others."

(verb) challenge. Synonyms: defy. Example: "I dare you!."