Used when someone begins traveling, especially where there's water or uncrossed paths involved. After months of preparation, they were ready to launch out on their voyage around the world.
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Metaphorical Use
It's often used metaphorically to mean starting something new, like an adventure or journey. She decided to launch out into a new field of study, leaving her comfort zone behind.
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Physical Departure
Imagine the act of pushing a boat out to sea—it's a physical beginning of a trip. They watched the ship launch out from the harbor at dawn.