A dictionary of Confusable Phrases: More Than 10,000 Idioms and Collocations

have an option on something • have the option of
something
have an option on something —have the right to buy smth.
at a certain price, usually within a certain period of time: If
I decide to sell the house you shall have first option on it.
have the option of something —have the ability to choose
smth. in preference to smth. else: A strike or war is preventive
if the enemy still has the option of desisting from his planned
aggression.
have bigger fish to fry • have other fish to fry
have bigger fish to fry —have a much more pressing issue to
attend to: If you think this case doesn’t matter — that the
Supreme Court has bigger fish to fry — think again.
Note: 
The expression does not correlate in meaning with the
phrase big fish— an important person in a company or an organ-
ization: Basically this guy was a big fish in the British Gov-
ernment. He wrote a couple of books…
have other fish to fry —(coll.) have other business to attend
to (also: have other irons in the fire): I can’t deal with that just
now. I have other fish to fry.
Note: 
The expression does not correlate in meaning with the
phrase there are other fish in the sea— there may be many other
people to choose from: It’s too bad that your secretary quit, but
there are plenty of other fish in the sea.
have both feet on the ground • stand on one’s own
two feet
have both feet on the ground —(also: have one’s feet on the
ground) have a sensible and realistic attitude to life: Catherine
in her spiritual writings has both feet on the ground, she lives
in the real world, she has uncommon common sense.
have an eye for something
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stand on one’s own two feet—(also: stand on one’s own feet) be
independent and able to take care of oneself: I want to be able
to stand on my own two feet without my parents telling me
what to do.