Have you ever finished your university work and then realised that you forgot to save it? Then you have to do the same project again! It’s so annoying! In this situation you can say that you have to “start from scratch”.
When you start from scratch, you are doing something from the very beginning. Normally we use it when we have already finished a task but have to do it again for some reason. Normally the reason is because you made a mistake.
– “It took me 3 days to edit the video, but I lost the recording so now I have to start from scratch! I’m really annoyed!”
– “I painted my house this weekend but I used the wrong paint to I have to paint it again, starting from scratch”
– “I did my homework but my dog ate it, now I have to start from scratch“