Definition of put the clocks back or forward in English:
Adjust clocks or watches backward (or forward) to take account of official changes in time.
- It's October 27th, and three days before we put the clocks back.
- We put the clocks forward a couple of days ago, it's British summertime.
- I have put my clocks forward, apart from the three that are radio-controlled and should look after themselves.