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

lucky strike • stroke of luck
lucky strike —
1
. a fortunate discovery: Would they … come
back to civilization with the story of a lucky strike to account
for the gold they brought? 2. a chance piece of good fortune:
It was a lucky strike that we were able to land so close to the
boat, so we could follow the plan.
stroke of luck — = lucky strike 2: My son was going over there
anyway, so it was just a stroke of luck that they ended up being
so close together.
lunar politics • lunatic policy
lunar politics— said of matters of no practical concern:
Hume’s subtle intellect takes up a great many problems and
shows us that they are essentially questions of lunar politics.
lunatic policy —madly foolish, idiotic policy: I’m afraid we’re
a long way from the degree of understanding that is required
to change our lunatic policy into a more positive direction.
M
mad about something • mad for something
mad about something —(coll.) 
1
. very enthusiastic about
smth.; excessively interested in smth.: Most of the folks I’m
particularly close to are as mad about sport as I am. 2. very
angry about smth.: Viola says she got mad about that interview
in the paper, about marriages being broken up.
mad for something —(coll.) 
1
. craving or longing for smth.:
Still we were all mad for food, and madmen cannot be made
responsible for their actions. 2. carried away by some strong
emotion: I was mad for joy. It was so beautiful that I wept
while approaching the enchanting place.
mad as a March hare • mad as a wet hen
mad as a March hare —crazy; insane: Anyone who thinks
the moon is made of green cheese is mad as a March hare.
mad as a wet hen —(also: mad as a hornet) very angry;
extremely irritated: Mrs. Harris was mad as a wet hen when
the rabbits ate all her tulips.