submarining1
/ˌsʌbməˈriːnɪŋ/ /ˈsʌbməriːnɪŋ/noun
The action of submarine.
Origin
Mid 19th century. Partly (originally) from submarine + -ing, and partly (in later use) from submarine + -ing.
submarining2
/ˌsʌbməˈriːnɪŋ/ /ˈsʌbməriːnɪŋ/adjective
That submarines.
Origin
Early 20th century; earliest use found in Gilbert Frankau (1884–1952), novelist and poet. From submarine + -ing.