Mislay, v. t. [imp. & p. p. Mislaid; p. pr. & vb. n. Mislaying.]
1. To lay in a wrong place; to ascribe to a wrong source. The fault is generally mislaid upon nature. Locke.
2. To lay in a place not recollected; to lose. The... charter, indeed, was unfortunately mislaid: and the prayer of their petition was to obtain one of like import in its stead. Hallam.
Shades of meaning
Fernald has no entry of its own for mislay; he lists it under displace.
He lists it without comment; the entries above explain its neighbors.