1. Roar: The most common meaning of "Hadeer" is "roar" as in the sound of thunder, a lion, or a powerful engine. It signifies a loud, deep, and rumbling sound.
2. Flow: Sometimes, "Hadeer" can also refer to the "flow" or "current" of water, particularly a strong or powerful current.
The meaning of "Hadeer" will depend on the specific sentence or context in which it is used.