潜せん入にゅう工こう作さくMeaningsNoun1. infiltration activities; undercover operation; covert workKanji used潜lurk入enter工construction作makeComposed of潜せん入にゅうinfiltration; sneaking in; going undercoverNoun工こう作さくhandicraft; work; construction; manufacturing; maneuvering; manoeuvringNoun