2chihm séui 潛水 — [submerge in water] to go from Kowloon to Hong Kong (or vice versa) by way of one of the cross harbour tunnels (taxi driver jargon for "crossing the harbour") (mp 1, 27.1999); to escape from law; to hide oneself; to cross the border illegally.
3chihm (séui) tèhng 潛(水)艇 — [submarine] an anti-social student concerned only with studying, a "book worm".