Meaning of extra-duty | Babel Free
Definitions
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.
not-comparable
Examples
“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.”
CEFR level
B2
Upper Intermediate
This word is part of the CEFR B2 vocabulary — upper intermediate level.
This word is part of the CEFR B2 vocabulary — upper intermediate level.
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