the act of swinging something one time / a katana

(military) captain (Japanese Air Self-Defense Forces, Japanese Ground Self Defense Forces) / (military) lieutenant (senior grade) (Japanese Maritime Self-Defense Force)

(informal) having divorced before

(alcoholism) Synonym of 一杯 (ippai, “one cup”) / (alcoholism) drinking

a day or two / today or tomorrow / tomorrow or the day after tomorrow

a male given name

one part

(idiomatic) "a fish who's found water" → In one's element, a duck to water.

absorbing (knowledge) very quickly and naturally

a European water vole (Arvicola amphibius)