Longman Dictionary of Contemporary English
The Collaborative International Dictionary
Sea legs \Sea" legs`\
Legs able to maintain their possessor upright in stormy
weather at sea, that is, ability to stand or walk steadily on
deck when a vessel is rolling or pitching in a rough sea.
[Sailor's Cant]
--Totten.
Wiktionary
n. 1 (context idiomatic English) The ability, when walking aboard a ship, to anticipate the motion of the deck so as to walk steadily without losing balance. 2 (context idiomatic English) The ability to travel by ship without becoming seasick. 3 (context chiefly US English) (alternative namesurimi)
Wikipedia
Sea Legs is an American musical with music by Michael H. Cleary and lyrics by Arthur Swanstrom. The musical book by Swanstrom is based on the play The Cat Came Back by Laurence E. Johnson, Beula King, and Avery Hopwood. Produced by Albert Bannister and J. Edmund Byrne, the production opened on Broadway at the Mansfield Theatre where it ran from May 18, 1937 through May 29, 1937 for a total of 15 performances.
The cast included Dorothy Stone and her husband, Charles Collins.
"Sea Legs" is a song by American indie rock band The Shins, and is the fifth track on their third album Wincing the Night Away. The song was also released as the fourth single from that album in the United Kingdom on December 2, 2007 as a digital download. The 7" was limited to only 500 copies and came signed by the band. "Strange Powers" is a Magnetic Fields cover.
Sea Legs is a 1930 American Pre-Code comedy film directed by Victor Heerman and written by George Marion Jr. and Marion Dix. The film stars Jack Oakie, Eugene Pallette, Lillian Roth, André Cheron, Albert Conti, Harry Green and Jean Del Val. The film was released on November 29, 1930, by Paramount Pictures.