Idioms

The real worth or truth of something can only be judged by putting it to use or experiencing its results, not by appearances or promises. In modern usage the phrase is simply a call to look at results as the final test.

A pleasant prospect or promised reward that is attractive but highly unlikely ever to be realised; wishful thinking dressed up as a plan.

Completely and helplessly, especially completely in love; also, literally, turning a somersault or tumbling upside down.

So common, ordinary, or plentiful as to have almost no value; easy to find and not worth much.

To waste effort on something already settled, finished, or hopeless; to keep pressing an argument or cause that can no longer go anywhere.

To carry a lingering grievance or sense of grudging resentment, often looking for a chance to argue or prove oneself; to be touchy and quick to take offence because of a perceived slight or injustice.

To exhaust yourself by doing too much, especially by staying up late and rising early, or by pushing your energy and resources beyond what can last.

To take on more than you can handle: a task, commitment, or responsibility bigger than your time, ability, or resources can manage.

A costly possession that is more of a burden than a benefit — something expensive to keep, hard to get rid of, and of little practical use.

Feeling ill, unwell, or slightly out of sorts.