Operated or functioning like clockwork; mechanically precise and regular; or fitted with clockwork mechanisms.
Adjective formed from 'clockwork' (the internal mechanism of a clock) with the past participle suffix '-ed,' indicating something that has been equipped with or operates according to clockwork.
The phrase 'working like clockwork' became metaphorical shorthand for reliability—in the 19th century, clocks were humanity's most complex machines, so comparing anything to clockwork meant it was the epitome of precision and dependability.
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