What does “un café allongé” mean in French?

In France, a plain “café” is one small, strong espresso. If that feels too strong, ask for un café allongé. The waiter adds more hot water, so the cup is bigger and milder. The word comes from the verb allonger, which means “to make longer” or “to stretch.” Word for word, it is a “stretched coffee.” It is similar to an Americano, but a little smaller and stronger.

The speaker is drinking a coffee paid for by his fans on Ko-fi. He says: “c’est le premier café, le premier espresso allongé que je bois” — “it is the first coffee, the first stretched espresso I am drinking.” He uses “espresso allongé” and “café allongé” to name the same drink. The key word is the verb allonger, “to make longer / to stretch.” You hear the same root in other French phrases: allonger le pas means “to walk faster” (literally, to lengthen your steps). The opposite coffee order is un café serré — a “tight” espresso made with less water than usual. In a French café you can simply say: “Un café allongé, s’il vous plaît.” If you want milk added, ask for it separately — it does not come by default.