forestay noun 1verb 2forms 3 noun1 •A stay that extends from the top of the foremast to the bow or bowsprit of a sailing ship verb2 •To stay beforehand; secure or fasten with or as with a forestay.Anna decided not to press that subject and forestayed her mind to change tack. — 2008 •To stay, delay, postpone, or hinder beforehand; forestall; prevent. formsforestayed · forestaying · forestays