Cast aside Definition 1 of 3Pro Tip 1/3Emotional Impact Indicates a strong emotional response when rejecting something with disappointment. She cast aside the idea of reconciliation, feeling betrayed. Pro Tip 2/3Firm Decision Shows a decisive action, symbolizing a clear break from past considerations. After the scandal, the party cast aside its leader. Pro Tip 3/3Loss of Interest Implies losing interest in something once valued or wanted. He cast aside his hobbies as he grew older.