The Collaborative International Dictionary
To pin one's faith upon
Pin \Pin\, v. t. [imp. & p. p. Pinned; p. pr. & vb. n.
Pinning.] [See Pin, n.]
To fasten with, or as with, a pin; to join; as, to pin a
garment; to pin boards together. ``As if she would pin her to
her heart.''
--Shak.
To pin one's faith upon, to depend upon; to trust to.