ˌno-holds-ˈbarred adjective [only before noun]
a no-holds-barred discussion, situation etc is one in which there are no rules or limits:
Viewers had been promised a no-holds-barred interview with the former mayor.

[TahlilGaran] Dictionary of Contemporary English ▲

no holds barred
no limits or controls.
This is comedy with no holds barred, and it may offend some viewers.

I like nothing better than a fight with no holds barred.

Etymology: based on the sports meaning of hold (= a position in which you prevent someone from moving) and the idea of a fight in which no holds are barred (= not permitted)

[TahlilGaran] English Idioms Dictionary ▲

no-holds-barred
no holds barred - without limits or controls.
In a no-holds-barred campaign, the nice guys are always the losers.
(always before noun)

[TahlilGaran] English Idioms Dictionary ▲

no holds barred
with no restraints
There were no holds barred during the debate between the politicians.

[TahlilGaran] English Idioms Dictionary ▲