Third-person singular simple present indicative form of double.(verb)
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Use "doubles" in a sentence
"a superiority of knowledge and presumed judgment -- they have a method of patching up deep matches to _diddle the dupes_, and to introduce _throws over, doubles, double doubles_, to ease the heavy pockets of their burdens."
"The paycheck for making the round of 16 in doubles is $13,800 per pair."
"Their nickname doubles as a price for corn: buck an ear."