What is what does it mean to leave someone on read?

To "leave someone on read" means to read a message from someone on a messaging app or social media platform but choose not to respond to it for an extended period. This is a common behavior among people who don't want to engage in a conversation or who are too busy to reply immediately. It can hurt the person who sent the message, as it may feel like the person who left them on read is ignoring them or not interested in talking to them. In some cases, leaving someone on read may also indicate that the recipient of the message is upset or angry with the sender.