Fromlock +‎blade.

lockblade (plurallockblades)

1. Aknife whose blade can be locked in position when fully extended.
   • 1993,Field & Stream, volume97, number12, page111:

     Whether you are buying alockblade, a fixed-blade or a pocket knife, the choice of brands is easy:[…]

   • 2011, Christopher R. Howard,Tea of Ulaanbaatar:

     He cuts the fruit with his Gerberlockblade. The steel blade glistens, slips effortlessly inside.

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