makan = to eat, or a meal
The food in Singapore is delicious, affordable, and everywhere. Because of this, you will find that a lot of conversation will revolve around food. This will therefore be a very useful word for you to know.
The word makan (from my experience so far) is especially useful in the planning of meals. You can now use this word in contexts such as: “You makan already?” or “Want to makan?” or “Where do you want to makan?”