Crossword puzzle clue "sail motions"

FLAP, to move, as of wings

a device which can be set to guide and control an aircraft or a ship on a chosen course

AYE, an affirmative vote, also AY

BALK, to refrain from proceeding, also BAUK, BAULK

(French) a written or (now usually) acted clue from which a syllable of a word or a complete word is to be guessed

CURTSY, to bow politely, also CURTSEY