from The Century Dictionary and Cyclopedia
- n. A device which slides or slips on two parts of a mechanism for their relative adjustment.
Sorry, no etymologies found.
The slip-catch was that the United States was handling the search like a top-secret, national security matter.
He could have gone direct by the front door into the street, so leaving her to her odd self; but, instead, he drew back the slip-catch of the garden door and opened it, self-consciously humming a tune.