bright side

bright and early

(Very) early in the morning.

bright lights

The glamour and glitz of a place, especially a big city.

bright line

A clear distinction in the context of a legal, moral, ethical, or analytical judgment.

bright spark

A person who is intelligent, clever or quick-witted.

bright young thing

One who is youthful, clever, eager, and high-spirited in manner and attractive in appearance.

err on the side of

To behave in a manner which favours or which is biased toward.

err on the side of caution

To act in the least risky manner in a situation in which one is uncertain about the consequences.

get out of bed on the wrong side

To start the day in a bad mood for no apparent reason.