Back when意思

"Back when" is an English phrase that is used to refer to a period in the past, often a time that is considered earlier or more distant than the present moment. It is often used in conversation to introduce a story, memory, or fact that happened in the past. For example:

"Back when I was a kid, we didn't have smartphones."

In this sentence, "back when" is used to indicate a time in the past, specifically the speaker's childhood, which is considered earlier than the present time. The phrase can be used to refer to any past period, from a few years ago to centuries in the past, depending on the context.