One of the mysteries of the English language finally explained.
A compound of glue and sugar, originally a preparation of isinglass, which becomes adhesive when moistened (typically with the tongue). Also (occasionally): †= "isinglass" (obsolete).
Late 16th century; earliest use found in John Baret (d. 1578), lexicographer. From mouth + glue.
mouth glue/ˈmaʊθ ɡluː/
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