Swam swiftly, caught slippery prey.
Meaning: This sentence tells us that the penguin swam quickly and caught a fish that was hard to hold because it was slippery.
Choice of Words: Swam means to move through water using your arms and legs. Swiftly means moving quickly and easily. Slippery means difficult to hold because it's smooth or wet. Prey is an animal that is hunted and eaten by another animal.
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Related Expressions