This
database is a comprehensive collection of all the American idioms and slang available.
American Idioms are many and varied. We hope you enjoy our collection. We are adding more all the time.
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If a problem is 30, the problem is the person who sits 30 cm from the computer screen. It is used to describe people that lack technical knowledge and can be used when you insult someone who's having computer problems.
(UK) If you look after the pennies, the pounds will look after themselves, meaning that if someone takes care not to waste small amounts of money, they will accumulate capital.
('Look after the pence and the pounds will look after themselves' is an alternative form of this idiom.)