1. Listen quietly, without contributing to the conversation 
2. Listen without the speaker's knowledge
   - eavesdrop, earwig [Brit]

Derived forms: listening in, listens in, listened in

Type of: listen

• pilferer
• pilgarlic
• pilgrim
• Pilgrim Father
• pilgrim's journey
• Pilgrim's Progress
• pilgrimage
• piling
• Pilipino
• pill
• pill bottle
• pill bug
• pill head
• pill pusher
• pill roller
• pillage
• pillaged
• pillager
• pillaging
• pillar
• pillar box
• pillar of Islam
• pillar of strength
• pillar-box red
• pillar-shaped