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Pronunciation varies by accent · adjective
(tennis) Describing a tennis ball having a thicker felt woven more loosely around the ball's core, designed for hard court surfaces such as asphalt or concrete..
Coordinate term: regular-duty
The men at the U.S. Open use what is known as an “extra-duty” ball, which means the felt on the outside of the ball is woven slightly more loosely than the “regular-duty” ball the women use. […] Extra-duty balls are the balls of choice for outdoor hardcourts, like those at the U.S. Open, except when they are not.
Use extra-duty when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Extra-duty means (tennis) Describing a tennis ball having a thicker felt woven more loosely around the ball's core, designed for hard court surfaces such as asphalt or concrete..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Coordinate term: regular-duty
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