vbl. sb. [f. UNLOCK v.] The action of the verb, in various senses.

1

[1719.  Boyer, Dict. Royal, II. Unlocking, ouverture, l’action d’ouvrir.]

2

1825.  J. Nicholson, Operat. Mechanic, 509. The scape-wheel teeth … [being] under-cut for the purpose of avoiding friction … and for safe unlocking.

3

1890.  Retrospect Med., CII. 128. The sudden unlocking of abnormal metabolic processes.

4

  attrib.  1850.  Chubb, Locks & Keys, 25. An unlocking notch in the outer edge of the slider.

5

1884.  F. J. Britten, Watch & Clockm., 276. Unlocking Resistance … [is] the resistance opposed to unlocking … by the draw of the locking faces.

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