The word "tatu" is a noun that refers to a type of animal known as an armadillo, which is about three feet long, not including its tail. Armadillos are small to medium-sized mammals that have a protective shell covering their bodies. They are often found in warm regions like the southern United States and parts of Central and South America.
In some cultures, "tatu" may also refer to the animal in a more specific or localized way. For example, in some regions of Latin America, "tatu" can refer to various species of armadillos.
There are no well-known idioms or phrasal verbs specifically related to "tatu," but you might hear expressions about "coming out of your shell," which can metaphorically relate to the protective nature of the armadillo.
The word "tatu" refers specifically to a type of armadillo that is about three feet long, exclusive of its tail.