Я58
РУССКИМ ЯЗЫКОМ говорить, спрашивать и т. п.
collNP instrumInvaradvfixed WO ( usu. said with irritation when the speaker must repeat sth. because of the interlocutor's failure to understand, unwillingness to comply etc) (to say, ask etc sth. ) perfectly clearly
in plain Russian
in plain language (words)in no uncertain terms.