Begged off is a phrasal verb that means to avoid doing something or to decline an invitation. Its antonyms would be to accept or take on the task or invitation without hesitation. Other antonyms for begged off could be to commit or agree to something, to comply, to acquiesce, to embrace or to participate. The opposite of begged off, in short, is for an individual to take initiative and be willing to step forward and take on a responsibility or accept an invitation with enthusiasm. It is important to be aware of antonyms for words to develop a better understanding of their meanings and to improve one's vocabulary.