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.