. "\"Any process that stops, prevents, or reduces the frequency, rate or extent of the directed movement of ions from one side of a membrane to the other.\" [GOC:mah]" . . "negative regulation of ion transmembrane transport" . "down regulation of transmembrane ion transport" . "down-regulation of transmembrane ion transport" . "downregulation of transmembrane ion transport" . "negative regulation of transmembrane ion transport" . . . . "inhibition of transmembrane ion transport" .