They were expected to approve one another´s decisions.
Explanation:
Roman Consuls had the highest elected political powers in the Roman Republic. They served one year term and were elected two consuls to serve jointly by the Roman citizens.
They alternate the power to control the military and government entities each month. Each of them had veto power over the legislation of the other and once they completed the term they couldn´t be elected any more.
It means, for example if I say, "I go to the park every now and then", then it isn't a common event, but happens often enough not to be classified as a rarity.
