潜行

Noun

 * 1) traveling underwater
 * 2) traveling secretly
 * 3) working secretly, undercover activity
 * 1) working secretly, undercover activity

Verb

 * 1) to travel underwater
 * 2) to travel secretly
 * 3) to work secretly, to act undercover
 * 1) to work secretly, to act undercover
 * 1) to work secretly, to act undercover
 * 1) to work secretly, to act undercover