Idiom of the day :- Watch one’s language

Usage, examples and definition of the Idiom :-

Long ago when our ancestors wrote using pictorial characters it was probably easy to watch one’s language. Today, however, watch your language is a command meaning to be careful how one speaks and especially to be careful not to say impolite or naughty things. ‘You boys watch your language or I’ll send you tot he office,’ the teacher warned.