fays is a form of:

Fay



ENGLISH MEANING
noun
1.
A fairy; an elf.
2.
Faith; as, by my fay.
verb
1.
(TRANSITIVE) To fit; to join; to unite closely, as two pieces of wood, so as to make the surface fit together.
2.
(INTRANSITIVE) To lie close together; to fit; to fadge; -- often with in, into, with, or together.