a pound to a penny

an ounce of prevention is better than a pound of cure

Precaution and prevention of an undesirable thing is preferable to dealing with its potential consequences.

bad penny

A person or thing which is unpleasant, disreputable, or otherwise unwanted, especially one which repeatedly appears at inopportune times.

Merry-go-round

[Cockney slang]pound

In the sterling sense. Referring to the saying that "money was made round to go round".

penny for your thoughts

Used to inquire into the thoughts and feelings of another, especially when the person appears pensive or conflicted.

penny in the fusebox

An improvised repair made with no regard for safety.

penny pincher

One who spends little money; one who is very frugal or cautious with money.

penny wedding

A wedding at which the guests contribute payments in order to fund the event and to benefit the newly-married couple.

penny wise and pound foolish

Prudent and thrifty with small amounts of money, but wasteful with large amounts.