Horses' gums recede with age, leading to longer teeth. A common way to inspect a horse's worth is to check it's mouth, hence the phrase. Receiving a horse as a gift and immediately inspecting its value was considered offensive, much like inquiring about the worth of a present today is rude.
Poetry is the first major literary genre. All types of poetry share specific characteristics. In fact, poetry is a form of text that follows a meter and rhythm with each lines and syllables. It is further subdivided into different genres such an epic poem, narrative, romantic, dramatic, and lyric.
Poetry is a type of literature based on the interplay of words and rhythm. It often employs rhyme and meter (a set of rules governing the number and arrangement of syllables in each line). In poetry, words are strung together to form sounds, images, and ideas that might be too complex or abstract to describe directly.