"When I get back from holiday, I expect the house to be tidy."
2.VerbReply (to someone); follow up (with someone).
"I'll get back to you on that by Wednesday.; Please get back to me about his complaint. ["to" here connotes "reply".]; Please get back with me about his complaint. ["with" here connotes "meet with", physically or virtually.]"
3.VerbTo retrieve (something); to have (something) returned.
"I lent her my guitar over the Christmas holidays, and will get it back when the term starts."
4.VerbTo do something to hurt or harm (someone) who has hurt or harmed one; to take revenge.
"I'll get you back for this!; I'll get him back for this!; I'll get back at all of them for this!"