The phrase "cucumber slices" refers to thin, round pieces of a cucumber that have been carefully cut from the vegetable using a sharp knife. These slices are often used in various culinary dishes or as a healthy snack on their own, and can be eaten raw or cooked depending on personal preference. The term is also sometimes used figuratively to describe someone who appears calm and composed, even in the face of stressful situations - much like how one might imagine a cucumber slice remaining cool and unruffled while resting on top of a salad.