Múþ-bersting

According to the Old English Dictionary:

e;

múþ-bersting

f. A breaking out about the mouth :-- Múþberstingc (in a list of diseases) frenus (cf. frenusculi, ulcera circa rictum oris, similia his quae fiunt jumentis asperitate frenorum, Isid, 4, orig. 8), Wrt. Voc. i. 20, 14. Múþbersting, ii. 39, 17. Múþberstung, 150, 56. muþ-bersting