Call back Definition 1 of 5Pro Tip 1/3Expectation of Timeliness Calling back should be done soon after the missed call for politeness. Sorry I missed your call, I'll call you back in 10 minutes. Pro Tip 2/3Casual Conversations 'Call back' is often used in informal contexts among friends and family. I'm busy right now, can I call you back later? Pro Tip 3/3Professional Courtesy In a business setting, failing to call back can be seen as unprofessional. I'll call you back after the meeting to discuss the contract.