Why People Say ‘O’Clock’ When Referring to the Time
by Glen Tickle from Laughing Squid on (#1WEK8)

Daven Hiskey filled in for an episode of Today I Found Out to explain why people say "O'clock" when referring to the time. The habit began as a function of people using different methods to tell the time, and has gone through some linguistic changes over the years to evolve to where it is today.
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