Stir the soup until it starts to bubble.
Meaning: This means to keep moving the spoon in the soup until you see small round shapes forming on the surface.
Choice of Words: Stir means to move a spoon or other utensil around in a liquid to mix it. Soup is a liquid food made by boiling meat, vegetables, and other ingredients together. Until means up to the time when something happens. Bubble means to form small round shapes on the surface of a liquid when gas escapes from it.
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Related Expressions