the GNU version of the Collaborative International Dictionary of English
verb-intransitive. To open or loose by lifting the latch.
The Century Dictionary and Cyclopedia
To open or loose, as a door, by lifting the latch; also, to loose the latchet of: as, to unlatch a shoe.
To become open or loose through the lifting of a latch.
Word Usage
"I was fingering a vast array of multicolored, multipurpose, neat and folded undergarments, in ever-towering fascination; and I heard the door unlatch, precipitously, smoothly along its well-oiled carvings."