de-tent

detent

[dih-tent]
noun Machinery.
a mechanism that temporarily keeps one part in a certain position relative to that of another, and can be released by applying force to one of the parts.

Origin:
1680–90; < French détente, Old French destente, derivative of destendre to relax, equivalent to des- dis-1 + tendre to stretch; see tender2

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World English Dictionary
detent (dɪˈtɛnt)
 
n
See also pawl the locking piece of a mechanism, often spring-loaded to check the movement of a wheel in one direction only
 
[C17: from Old French destente, a loosening, trigger: see détente]

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