gimble means to grin or smile. Lexicurio rates it Sui generis — a strength score of 88 out of 100.
gimble is pronounced /ˈɡɪmbəl/.
Etymology
Compared by the EDD to dialectal Swedish gimla (“to move the lips in an unseemly manner, to make a wry face, to move the lips awry”). Compare also North Frisian gēmeli (“to move the lips before laughing”). Nall compares Old English ginian; the hard g in this form needs explanation (its standard English descendant is yawn), though the EDD does record a variant form jimble (/ˈjɪmbəl/).
verb
- To grin or smile.“GIMBLE, v. to grin or smile. Though the g in this word is hard […] ]”