| Idiom | Meaning | Example |
| a fifth wheel |
a useless object, an unnecessary device
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The team already had two guards, so I felt like a fifth wheel.
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| a fighting chance |
a fair chance, a good chance
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If I can get a job interview, I'll have a fighting chance.
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| a fill-up |
a full tank of gasoline, fill her up
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We got a fill-up before we left Winnipeg. The truck needed gas.
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| a fine line |
a close relationship, not much difference
|
Sometimes there is a fine line between love and lust.
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| a fine-toothed comb |
a careful search, a search for a detail
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She read the file carefully - went over it with a fine-toothed comb.
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| a firm hand |
a person who will discipline people
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The students in Grade 8 need a teacher with a firm hand.
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| a flash in the pan |
a person who does superior work at first
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I'm looking for a steady worker, not a flash in the pan.
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| a fleeting glance |
a very brief look, a quick glance
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A fleeting glance from Marilyn would make his heart beat wildly.
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| a fly on the wall |
able to hear and see what a fly would see and hear
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I'd like to be a fly on the wall in the Judge's chambers.
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| a fool and his money are soon parted |
a fool will spend all his money quickly; easy come, easy go
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After he had spent his fortune, he remembered this saying: A fool and his money are soon parted.
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