fair and square - honestly, without cheating
fair-weather friend, a - a person who doesn't help when a friend is in trouble
feather in one's cap, a - something to be proud of and to feel
feel blue, to - to feel sad
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feel it in one’s bones, to - to know something, often before seeing it or before it happens
fishy - suspicious, not right or honest
flash in the pan, a - something that starts out well but that may not continue
fill in the ointment, a - a problem
for a change - in order to do something different
for a start - beginning with the first of many reasons
for the time being - temporarily, just for the present moment
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forty winks - a short sleep, a nap
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fuddy-duddy - someone who doesn't like change
full of hot air - talking a lot but never doing what one says
