"To set a timer" means to select a specific amount of time on a device, like a clock or phone, so that an alarm will go off when that time is up. It helps you remember to do something after that set time or keep track of how much time has passed.
Sentences with «to set a timer»
Back into the oven it goes, so set that timer for 30 minutes and wait for the magic to happen! (thecomfortofcooking.com)
, so set a timer on your phone 30 minutes before bedtime as a reminder to start winding down. (bonnenuitbaby.com)
Help children by setting a timer so each can have a five minute turn with it. (diaperpincorner.com)