the.com/stag

Going alone, on purpose, like your own company is the plan, not the backup.

means To attend an event or do something socially without a partner or date, by choice rather than circumstance.

from Rooted in the literal 'stag' — the male deer that roams and feuds apart from the herd, a solitary, antler-clashing loner. By the 1800s 'stag' had leapt to describe men socializing without women (a 'stag party' or 'stag night'), and from there the word stretched further to mean going solo to any event, date optional. The deer's independence became a lifestyle choice.

origin
from male deer, famously antisocial except in rut
stag party
predates the bride's version by centuries
stag beetle
named for antler-like jaws, not solo habits
going stag
dating term for arriving without a date, defiantly
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