Soap/səʊp/ Definition 1 of 4Pro Tip 1/2Physical Form Soap comes in various forms, like bars, powders, and liquids, for different cleaning purposes. She preferred liquid soap for washing dishes. Pro Tip 2/2Metaphoric Use 'Soap' can metaphorically imply purity or the act of cleansing beyond physical cleaning. His apologies were like soap, washing away the tension.