1. past tense of infiltrate; to enter or gain access to gradually and secretly
Usage: often used in military or espionage contexts
2. past tense of infiltrate; to pass into or through by filtering or permeating
Usage: used for liquids, gases, or substances

Examples

• The spy infiltrated the enemy organization.
• Protesters infiltrated the peaceful demonstration.
• Water infiltrated the basement through cracks in the foundation.
• The detective infiltrated the criminal gang to gather evidence.
• Rainwater slowly infiltrated the soil.
• Government agents infiltrated the rebel group.
• Oil infiltrated the groundwater supply.