act with decorum

Mr Trump has threatened to walk out of future press briefings if reporters do not act with "decorum".

The leaders sent an appeal to lawmakers in advance of Pope Francis’ speech Thursday morning, asking them to act with decorum in his presence.

How sick I am of people who think that the elderly should act with decorum until they fade out and quietly drop dead in their cardigans.

The stereotypes are long-lasting: They don't vote regularly and don't act with decorum.

There are no disastrous fires, trains run without mishap, burglars go on a vacation, society leaders act with decorum—in a word the city is deadly dull.