One's mouth is like a tumbling river -- talk rapidly.; A great talker makes a torrent of words.; be eloquent; have a great flow of speech; let loose a flood of eloquence; One's eloquence may be compared to a fastflowing stream.; One's talk flows like a cataract, in a never-ending stream.; One's words pour forth like a rushing river.; speak incessantly like a stream; talk as continuously as flowing water; talk glibly; talk (on and on) in a flow of eloquence; utter a torrent of words