Run after ball.
Meaning: This means to move quickly towards a moving ball in order to catch it. It's like saying, Move quickly and chase the ball.
Choice of Words: Run is a verb that means to move at a fast pace. After is a preposition used to indicate that something is following or pursuing something else. Ball is a round object used in many sports and games. Here, the sentence implies a command to move quickly in pursuit of a ball.
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Related Expressions