Longman Dictionary of Contemporary English homepage

clockwork

 noun
     
Related topics: Power
clock‧work [uncountable]
1TP British English clockwork toys, trains, soldiers etc have machinery inside them that makes them move when you turn a key:
mechanical toys powered by clockwork
The tape was driven by a clockwork motor.
2

go/run like clockwork

to happen in exactly the way you had planned:
The concert went like clockwork.
3

like clockwork

also

(as) regular as clockwork

happening at the same time and in the same way every time:
Matt came round each Friday, regular as clockwork.
4

with clockwork precision/accuracy

in an extremely exact way
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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