RDAnoun [ C usually singular ]uk /ɑːdiːˈeɪ/ us /ɑːrˈeɪ/
› abbreviation for recommended daily allowance
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(Definition of “RDA” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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to (cause someone to) be in a position in which the lower part of the body is resting on a seat or other type of support, with the upper part of the body vertical