1. underground prison cells, especially in castles
Usage: historical
2. dark underground rooms or chambers

Examples

• The castle’s dungeons held political prisoners for decades.
• Medieval dungeons were cold, damp, and windowless.
• The tour guide showed us the ancient dungeons beneath the fortress.
• Prisoners were kept in the castle’s dungeons without trial.
• The old mansion had creepy dungeons in its basement.
• They explored the underground dungeons with flashlights.