From Longman Dictionary of Contemporary Englishask/beg somebody’s pardon (for something)ask/beg somebody’s pardon (for something)old-fashioned to ask someone to forgive you Walter begged her pardon for all the pain he had caused her. → pardon
Examples from the Corpus
ask/beg somebody’s pardon (for something)• In 1182, he asked formally for pardon, prostrating himself before Barbarossa.• I ask you to pardon me.• I am ashamed of it myself, and for this reason I stoop to beg your pardon. 