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