Scrabble?! INFILTRATE

Definitions of INFILTRATE in various dictionaries:

verb - cause (a liquid) to enter by penetrating the interstices

verb - enter a group or organization in order to spy on the members

verb - pass into or through by filtering or permeating

verb - pass through an enemy line

To pass (troops, for example) surreptitiously into enemy-held territory.

To penetrate with hostile intent: infiltrate enemy lines; a team of terrorists that had infiltrated the country.

To enter or take up positions in gradually or surreptitiously, as for purposes of espionage or takeover: tried to infiltrate key government agencies with spies.

To cause (a liquid, for example) to permeate a substance by passing through its interstices or pores.

To gain entrance gradually or surreptitiously.