The word of the day is tacit, a formal adjective that describes something that is expressed or understood without being directly stated. It can be used to describe an agreement or understanding between people that is not explicitly stated. For example, roommates may have a tacit agreement not to pry into each other's affairs. The word tacit can also be used to describe approval or insults that are implied but not directly expressed. In the example from Emily Brontë's Wuthering Heights, the narrator uses facial expressions to convey tacit insults to the dogs. Tacit can also mean implied or indicated by an act or silence, but not expressed. The word has its roots in the Latin verb tacēre, meaning to be silent, which is also the ancestor of the English adjective taciturn. Taciturn is used to describe someone who tends to be quiet, and it is related to the word tacit. The word tacit is often used in formal or written language to describe subtle or implied meanings. Overall, the word tacit is a useful term for describing things that are understood or implied without being directly stated.