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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fail to keep one's attention focused on the ball or the matter
at hand
fail to keep one's attention focused on the ball or the matter at handHe took his eye off the ball for only a second and the other team quickly scored a goal.
This indicates that the person described is unaware of his or her good fortune or is unaware of how difficult day to day life was before he/she was born. Typical usage: 'Kids today don't know they are born'.