| Idiom | Meaning | Example |
| flat broke |
having no money, out of cash
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By the end of my first term at university, I was flat broke.
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| flat out |
as fast as possible, pedal to the metal
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Scott was driving flat out most of the way - over 180 km per hour.
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| flatfoot |
policeman, a constable who walks the streets
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Ted is a flatfoot in Regina. He works for Regina City Police.
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| flatfooted |
(See caught flatfooted)
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| flatliner |
a person whose emotions do not change
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The doctor is a flatliner. His face shows no joy, no sorrow.
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| flattery will get you nowhere |
saying nice things will not help you, kiss the blarney stone
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When I complimented Anna on her hair, she said, "Thanks, but flattery will get you nowhere."
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| fleeting glance |
(See a fleeting glance)
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| flesh out |
add information, make complete
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Here's the outline, Pat. You can flesh it out later.
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| Fletcherize your food |
chew your food many times, chew your food until it is easy to digest
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"Here, Fletcherize this." "Yuk, your pancakes are as tough as leather!"
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| flew the coop |
departed, left home
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Brian flew the coop last night. He packed a suitcase and left.
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