the.com/jag

A short burst of indulgence, like your emotions forgot to pace themselves.

means A spell of unrestrained activity or emotion — a crying jag, a drinking jag — intense, a little reckless, and over when it's over.

from Jag started out in English meaning a sharp, pointed thing — a notch, a spike, a prickle (think 'jagged'). Nobody's fully sure how it leapt from 'spike' to 'spree,' but one plausible path is through 'jag' meaning a small load carried on a cart or packhorse, which drifted into slang for a load of drink — getting a 'jag on' meant loading up. From there it widened to any emotional bender: crying jags, laughing jags, the whole binge of feeling.

origin
from 16th century word meaning sharp notch
usage
crying jag, shopping jag, drinking jag
vibe
intense, brief, mildly regrettable afterward
not
unrelated to jaguar despite sounding feline
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