खून पसीना एक करना

You use it as a verb phrase. The verb karna (to do) changes based on the subject. If you did the work, say maine khoon paseena ek kar diya. It usually describes a long-term effort. Don't use it for small tasks. Use it for big life achievements. It sounds very passionate and sincere.

Use it when discussing a big promotion. Use it when talking about building a house. It fits perfectly in emotional family conversations. Tell your parents you worked hard for your grades. Use it in a job interview for impact. It shows you are a gritty person. It’s great for sports victories too.

Don't use it for making a sandwich. Avoid it for minor chores like laundry. It will sound sarcastic or overly dramatic. If you use it for small things, people might laugh. It’s too heavy for a casual 'busy day' at the office. Keep it for the 'big wins' and 'heavy lifts.'

India has a deep history of manual labor and farming. For a farmer, sweat and blood are daily realities. This phrase honors the dignity of hard work. It is often used in Bollywood rags-to-riches stories. It resonates with the middle-class struggle for success. It’s a badge of honor in Indian society.

Sometimes people just say paseena bahana (to shed sweat). That is a milder version. You might also hear din-raat ek karna (making day and night one). Both mean working very hard. However, adding khoon (blood) makes it the most powerful version. It implies a sacrifice of the self.