English
laugh-out-loud
From laugh + out + loud.
A compound of laugh + out + loud
Proto-Indo-European *klek- ‘to laugh, cackle’
Proto-Germanic *hlahjaną ‘to laugh’
Proto-West Germanic *hlahhjan ‘to laugh’
Old English hliehhan ‘to laugh’
Middle English laughen
English laugh
Proto-Indo-European *úd ‘upwards, away’
Proto-Germanic *ūt ‘out’
Proto-West Germanic *ūt ‘out’
Old English ūt ‘out’
Middle English out
English out
Proto-Indo-European *ḱlew- ‘to hear’
…
Proto-Germanic *hlūdaz ‘loud’
Proto-West Germanic *hlūd ‘loud’
Old English hlūd ‘loud, noisy’
Middle English loud ‘loud’
English loud
Today it means
adj very funny; causing the listener to laugh aloud
Language periods are conventional ranges, not dates for this word.
Etymograph / laugh-out-loud