One breaking step showing remorse

• Feeling sorry about
• Showing regret
• Having second thoughts
• Penitent's activity
• Wishing undone, as an unethical act
• Kicking oneself for
• Having certain misgivings
• Deploring sort of turn in a circus?
• Feeling badly about

Wiktionary Word definitions in Wiktionary
vb. (present participle of rue English)