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self-locking
self-locking adj.
Brit. 
/ˌsɛlfˈlɒkɪŋ/
, /ˌsɛlfˈlɒkɪŋ/U.S. /ˌsɛlfˈlɑkɪŋ/
/ˌsɛlfˈlɑkɪŋ/ΚΠ
1825 Glasgow Mechanics' Mag. 2 322 (caption) Improved self-locking copying machine.
1938 Archit. Rev. 83 p. lx/3 The glass is held by a continuous self-locking spring aluminium cover strip.
2014 E. E. Fallowfield Dancing Debutante i. 6 My mother could not get in, as the door was self-locking.
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