1535 W. Stewart tr. H. Boece (1858) 605 Within ane nes ane rever mouth tha saw.
1790 J. Backus Diary 6 Dec. in W. W. Backus (1889) 93 Came down to the river mouth of a large run.
1866 C. Kingsley II. iii. 47 Hereward lay outside the river mouth, his soul..black with disappointment.
1997 A. Warner 36 That mother won't let us pick up the logs at the river mouth.