(1)a watch that is worn strapped to the wrist
(2)手首にひもで巻いて着ける時計
(3)a small portable timepiece
(4)小型の携帯用の時計
(5)a period of time (4 or 2 hours) during which some of a ship's crew are on duty
(6)船員が当番をする時間（4時間または2時間）