rule
as a rule usually, but not always.
divide and rule: seedivide.
play by the rules follow what is generally held to be the correct line of behaviour.
rule of thumb a broadly accurate guide or principle, based on experience or practice rather than theory.
2014Robert CringelyI Cringely Moore's Law doubles the performance of computers every couple of years and my old rule of thumb was that most people who make their living with computers are unwilling to be more than two generations behind.
rule(s), OK? used to express your enthusiasm for a particular person or thing. informal, humorous
2000Elle Here at ELLE we've always been big fans of Kerrigan's urban babewear, and this season…she really rocked. Daryl K rules, OK?
rule the roost be in complete control.
☞ The original expression was rule the roast, which was common from the mid 16th century onwards. Although none of the early examples of its use shed any light on its source, we can surmise that it originally referred to someone being the most important person at a banquet or feast. Rule the roost, found from the mid 18th century, has now replaced the earlier version.
rule someone or something with a rod of iron: seerod.
run the rule over examine cursorily for correctness or adequacy. British
2013Motley Fool Our analysts at Motley Fool Share Advisor run the rule over such businesses daily. I want to invest in them. And so do you. But we both want to know that they won't be a one-generation wonder.
work to rule (especially as a form of industrial action) follow official working regulations exactly in order to reduce output and efficiency. chiefly British