o'clockadverb
uk/əˈklɒk/us/əˈklɑːk/A1 used after a number from one to twelve to say the time when it is exactly that hour:
It's two o'clock.
He called me at four o'clock in the morning.
informal humorous used to refer to a time of day when you usually do or have a particular thing:
For many mums, the kids' bedtime is chocolate o'clock.
It's wine o'clock!
More examples
- Make sure you're there by five o'clock.
- I always get up at six o'clock.
Thesaurus: synonyms and related words
Days & times of day
- afternoon
- afternoons
- am
- at the crack of dawn idiom
- bedtime
- circadian
- crepuscular
- in the dead of night/winter idiom
- last orders
- lighting-up time
- local time
- lunch hour
- office hours
- opening time
- overnight
- playtime
- pm
- rush hour
- twilit
- watershed
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