To lower the topsail, in token of surrender; to yield.(verb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "amain" in a sentence
"His bloodhounds twain he called amain, and straightway gave her chase;"
"Failure to amain, that is, to douse your topsail or dip your colours when you meet with a ship of war -- the marine equivalent for raising one's hat -- constituted a gross contempt of the king's service."
"Queen Pansie, as she might fairly have been styled, in reference to her position in the household, -- calling amain for grandpapa and breakfast."