'We bumped into eachother at the store' Another common phrase is 'we ran into eachother at the store.' It simply means you saw somebody at the store and either said hi or had a conversation. Its an unplanned meeting of somebody. 'We have more catching up to do' This is typically used for people who havent seen each other in a long time. They have to 'catch up', or talk about how theyve been and what theyve been doing since they last saw. 'She keeps in touch with her' Typically this is when people dont see eachother often but they still talk. For example, a friend of yours moved to another city a while ago, but you guys still talk on the phone or send emails or texts. Someone who has left your physical life, but you still talk or see eachother occasionally to 'catch up' ;)

1. You were doing some shopping when you met someone there that you know. That person was also out shopping. The two of you did not plan to meet each other there, but you were both in the shop at the same time by "coincidence" so you talked to each other for a while. 2. You talked with some that you have perhaps not seen for a while, but you didn't have a lot of time to talk to each other, so you said "we have more catching up to do" which means that you plan to meet again and talk some more. 3. "she keeps in touch" means that someone that you do not see regularly "keeps in touch". It means that she will sometimes call you on the phone or email etc.

"We bumped into each other in the store" means "this was a chance encounter. It was luck. I didn't plan to meet her. I went to the store. She went to the store. By coincidence, it happened to be at the same time." To "catch up" literally refers to a situation where you are following someone. You are behind them. You are going a little faster than they are. The distance shortens. You keep narrowing the distance. Finally, you reach them: you have "caught up" with them. When you meet someone you have not seen for a long time, you have a lot of things to talk about. You want to learn everything that has happened to them since you last met. Perhaps you last saw them in the year 2000. They start to tell their story. They bring you up to date. First you know what has happened to them up to 2005, then 2010, then 2015. You are "catching up" with where they are in life. When have heard everything, you have "caught up." "We have more catching up to do" means you have not heard everything, and you want to hear the rest of the story." "To keep in touch" means to communicate regularly.