sniggle · verb1
From an alteration (perhaps due to giggle) of snigger, itself a variant of snicker.
sniggle · verb2
See snig (“a kind of eel”) + -le (frequentative verbal suffix).
sniggle · verb3
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: To chortle or chuckle; snicker. Full definition →