A spat can refer to different things depending on the context. Here are some possible definitions:

• A young bivalve, such as an oyster, that has permanently attached to a surface.
• A cloth or leather gaiter covering the instep and ankle.
• A brief petty quarrel or argument.
• A sound like that of rain falling in large drops.

In summary, a spat can be a type of shellfish, a piece of clothing, or a minor argument.