extension rule

American  

noun

1. a folding rule having a sliding part equal in length to one section so as to permit exact measurement of internal dimensions.

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Example Sentences

Notably, Indiana’s Paul George and Utah’s Gordon Hayward were absent from Thursday’s selections, which means their teams will not be able to offer them potential five-year, estimated $207m ‘supermax’ contract extensions under the league’s new designated player extension rule, which comes into effect under the new collective bargaining agreement taking effect on 1 July.

From The Guardian