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| the offspring of a zebra and a donkey. |
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
tread water
Expend effort that maintains one's status but does not make much progress toward a goal, as in He was just treading water from paycheck to paycheck. This idiom alludes to the term's literal meaning, that is, "keep one's head above water by remaining upright and pumping the legs."