(~s)
1.
A ~ is a small pile of earth made by a mole digging a tunnel.
N-COUNT
2.
If you say that someone is making a mountain out of a ~, you are critical of them for making an unimportant fact or difficulty seem like a serious one.
The British press, making a mountain out of a ~, precipitated an unnecessary economic crisis.
PHRASE: V and Ns inflect disapproval