The word "tapered" is an adjective that describes something that gradually becomes narrower or thinner at one end. When we say something is tapered, we mean that it starts wide and then gets smaller as you move along it.
In more technical contexts, "tapered" can be used in design or engineering. For example, a "tapered beam" in construction might refer to a beam that is designed to be strong yet uses less material by being wider at one end and narrower at the other.
While "tapered" primarily refers to a shape, in other contexts, "taper" can also refer to a gradual decrease in intensity or quantity, such as "the pain began to taper off," meaning it started to lessen.
There are no specific idioms or phrasal verbs that use "tapered," but you might come across phrases like "taper off," which means to decrease gradually.
"Tapered" is a useful word to describe something that becomes narrower towards one end, applicable in various contexts from fashion to design.