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English definition of “firm sth up”

firm sth up

phrasal verb with firm     /fɜːm/ US  /fɝːm/ verb
to make something more certain or less likely to change : Could we have a meeting so we can firm up the details of our agreement ?Planning, expecting and arrangingPlotting and trapping
(Definition of firm sth up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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