put the clock back

• put the clocks back
• turn the clock back
• turn the clocks back

put the clock back (third-person singular simple present putting the clock back, present participle put the clock back, simple past and past participle put the clock back)

1. (idiomatic, intransitive) To change the time in a time zone to an earlier time, e.g. for the end of daylight saving time.

   Don't forget that this Sunday we put the clocks back an hour.

2. (idiomatic, intransitive) To put something back to the state it was in a previous era.

   He wants to turn the clock back to the 1950s.

• put the clock forward