Wallop/ˈwɑːləp/ Definition 1 of 4Pro Tip 1/2Physical Action Use 'wallop' when referring to a strong physical hit, often with an object or in sports. He gave the door a wallop and it finally opened. Pro Tip 2/2Sudden Impact 'Wallop' suggests a sudden or surprising hit with significant force. The ball walloped against the window, cracking the glass.