house rule
Noun
Meaning
A rule adopted by a particular establishment.
A rule used in playing a game that is not part of the official ruleset.
Source: en.wiktionary.orgExamples
Number one house rule of pool: don't lose in your own house.
Noun
A rule adopted by a particular establishment.
A rule used in playing a game that is not part of the official ruleset.
Source: en.wiktionary.orgNumber one house rule of pool: don't lose in your own house.