1890 Cent. Dict. 4202/3 Overmount, In framing or mounting pictures to be covered with glass, a piece of stiff paper or board cut to correspond with the margin of the engraving or picture to be mounted, and laid upon the picture to separate its surface from the glass in the frame; a mat.

2001 Independent (Nexis) 16 June 15 The unframed version includes an overmount... The artwork is also available framed in clear-lacquered oak, with overmount.

a1425 Medulla Gram. (Stonyhurst) f. 66 Trascendo, [read transcendo] to ouermount.

a1500 Roberd of Cisyle (Cambr. Ff.2.38) (1879) 504 (MED) For pryde wolde..Ouyrmownte goddys dygnyte.

1552 R. Huloet Abcedarium Anglico Latinum Ouermounte, transcendo.

1623 W. Shakespeare & J. Fletcher Henry VIII ii. iii. 95 With your Theame, I could O're-mount the Larke. View more context for this quotation

1804 J. Grahame Sabbath 2 While from yon lowly roof, whose curling smoke O'ermounts the mist, is heard, at intervals, The voice of psalms.

1845 S. Judd Margaret i. xvi. 145 The pretty purple ground-nut, which, despising its name, overmounts the tallest shrubs.

a1867 N. P. Willis Poems (1882) 236 There is a cloud between..Yet floats she as serene Into the heavens!—Oh God! that even so I could o'ermount my spirit-cloud, and go!

1978 Washington Post (Nexis) 2 Nov. c1 The same qualities led Warner to be ‘overmounted’ frequently in the hunts and races of the Virginia horse country.

1982 H. Crabtree Saddle Seat Equitation xiv. 74 The rider finds himself the owner of something that he..will surely outgrow within weeks—or he will be overmounted—which can be a real disaster.

1987 Horse Internat. Mar. 40/2 People over-mount themselves: they have a lively horse and a good goer, but whether they have the ability to drive or ride it is another matter.

1995 Albuquerque (New Mexico) Jrnl. (Nexis) 21 Jan. 3 It's important that a roper not be overmounted. When the roper gets better than his horse, he can get a better horse.