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chill-hardening
chill-hardening n. 
/ˈtʃɪlˌhɑːdnɪŋ/,
Brit. /ˈtʃɪlˌhɑːdn̩ɪŋ/
, /ˈtʃɪlˌhɑːdn̩ɪŋ//ˈtʃɪlˌhɑːdnɪŋ/U.S. /ˈtʃɪlˌhɑrd(ə)nɪŋ/
(see quot. 1874)./ˈtʃɪlˌhɑrd(ə)nɪŋ/Π
1874 E. H. Knight Pract. Dict. Mech. Chill-hardening, a mode of tempering steel-cutting instruments, by exposing the red-hot metal to a blast of cold air.
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