1. Tax: In the historical context, "laagan" is a term used for tax levied by rulers on their subjects, usually in the form of a share of agricultural produce.
2. The Movie: "Lagaan" is also the name of a popular Bollywood movie, released in 2001, which tells the story of a group of villagers in British India who challenge the British to a cricket match in order to avoid paying a tax.
Therefore, the English translation of "laagan" would be "tax," "levy," or "tribute" in the context of historical usage. However, it is also used as the title of a movie, in which case it is left untranslated.