the.com/giggle

a laugh that escapes before your dignity can stop it.

means To laugh in a light, silly, often nervous way, in short bursts you can't quite suppress.

from An imitative word — 'giggle' simply sounds like the noise it names, born of the same playful, echoic instinct that gave English 'cackle,' 'titter,' and 'chuckle.' It surfaces in writing around the 16th century and is likely related to similar sound-mimicking words in other Germanic tongues, such as Dutch 'giechelen' and German 'gickeln.'

contagious
Hearing one triggers your brain's mirror neurons instantly
uncontrollable
Suppressing it usually makes it worse
social glue
Most laughter happens in company, not at jokes
baby talk
Infants giggle months before they can speak
tickle defense
You cannot tickle yourself into one
for instance

hyena laugh — african wild dog vocalizations that sound like cackling laughter, documented in wildlife studies

kookaburra call — australian bird whose call sounds like human laughter, heard throughout eastern australia

laughing gull — atlantic seabird named for its distinctive laughing cry, found along north american coasts

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