¹ bug noun

• a usually small insect —often used before another noun
• a usually mild illness (such as a cold) that can be passed from one person to another
• a problem that prevents a computer program or system from working properly

² bug verb

• to bother or annoy (someone)
• to put a hidden microphone in (a room, telephone, etc.) in order to secretly hear what people are saying
• to stick out more than is normal especially because of surprise or fear—usually + out