Definitions

1. noun

A person who deliberately sets fires, especially for malicious or attention-seeking purposes.

“The police were investigating a series of arson attacks attributed to a firebug.”

2. noun

A small insect, typically a beetle, that is attracted to and feeds on fires or heat.

“The firebug crawled across the hot surface, its bright colors a warning sign.”

3. verb

To set fire to something, especially maliciously or for attention.

“The suspect was accused of firebugging the abandoned building.”