/ ˈtʃɔːtl; NAmE ˈtʃɔːrtl/ verb
to laugh loudly with pleasure or because you are amused :
[ v ]
Gill chortled with delight.
[also v speech ]
► chor·tle noun
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WORD ORIGIN
1871: coined by Lewis Carroll in Through the Looking Glass ; probably a blend of chuckle and snort .