1. to pass into or through something
2. to understand or discover the meaning of something difficult
3. to succeed in entering or becoming part of a group or organization

Examples

• The arrow penetrates the target.
• Sunlight penetrates the forest canopy.
• The detective penetrates the mystery.
• She finally penetrates the complex theory.
• The spy penetrates the enemy organization.
• Water penetrates the fabric easily.
• His gaze penetrates her thoughts.