Looking up...
The bat flew silently through the night sky.
This describes the nocturnal activity of bats.
a small flying mammal with wings, typically nocturnal and feeding on insects
Bats use echolocation to navigate in the dark.
This explains how bats find their way without light.
Bats are the only mammals capable of sustained flight.
a piece of sports equipment used in baseball or cricket to hit the ball
He swung the bat and hit a home run.
This describes using a baseball bat to score.
Baseball bats are typically made of wood or metal.
a tool used to strike something, such as a hammer or mallet
He used a bat to break open the crate.
This describes using a bat as a tool.
This usage is less common than the sports equipment meaning.
The meaning of 'bat' depends on the context. In nature, it refers to the animal, while in sports, it refers to the equipment.
The two most common meanings are the flying mammal and the sports equipment. Other uses are less frequent.
Old English 'bæt', possibly from Proto-Germanic 'batō', related to Old Norse 'bata' and Old High German 'batta'.
The word 'bat' can refer to both the animal and the sports equipment, so context is important.