You will notice I changed your thread's title (which used to read simply "idiomatic expressions") to include the actual phrase you needed help with.
From now on, please write down the actual phrase (or specific term, when applicable) on the title of each new thread you open, as this
1) assists our dictionaries' Search function, and
2) provides at-a-glance thread differentiation.
Thanks in advance for your future cooperation in this regard.