a case with flat sides and a handle, used for carrying clothes, etc. when you are travelling to pack/unpack a suitcaseExtra examples He got fed up of living out of a suitcase and left his job as a sales rep. He stuffed a few clothes in a suitcase and left. His only possession was a battered old suitcase of clothes. She snapped her suitcase shut and stuck on a label. The money was smuggled out in a false-bottomed suitcase. The suitcase was full of drugs. The suitcase was too heavy to lift. We had to lug our suitcases around for a week. travellers humping suitcases about He was carrying a battered leather suitcase. I threw a few clothes into a suitcase and left. I unpacked the suitcases. I’ve bought a suitcase with wheels. She checked in her suitcase and went for a coffee. She had been living out of a suitcase for weeks. The customs officer told him to open his suitcase. The suitcases were too heavy for her to carry. We had to carry our suitcases up three flights of stairs.