When I opened up the app, my heart sank, I got the blues, I knew I had bought a pig in a poke, a cat in a sack etc etc. Because there in front of my eyes, was the entire list of idioms (numbering about 800), that are defined and explained in this app, which might sound a goodly number, but in fact is, a minuscule portion of all the idioms and expressions in use in the English language today. So, do yourself a favour, and step around this one; there are many more fish in the sea!