Any process that stops, prevents or reduces the frequency, rate or extent of potassium ion export across the plasma membrane. [GO_REF:0000058, GOC:BHF, GOC:mtg_cardiac_conduct_nov11, GOC:rl, GOC:TermGenie, PMID:19646991]
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C5: Ontology GO: Gene Ontology GO:BP: GO Biological Process