This meaning refers to concealed microphones or transmitters used for surveillance.
Investigators searched the office for bugs.
The room had been fitted with secret bugs.
This is the third-person singular form of bug and informally means causing irritation or annoyance.
It bugs me when people arrive late.
The constant noise bugs her.
This informal meaning refers to bothering someone repeatedly with requests or questions.
He bugs his parents for extra money.
She bugs the manager about the delayed order.
