What is an idiom for concoct?

The best place is to go on your search engine and type in "list idioms"

Idioms are used for another way of saying things, in a more, creative way. As an example, if you were to say "That test was easy." You could have said it "That test was a piece of cake."

Get off your high horse Tongue in cheek Spill the beans Cat got your tongue Wet blanket Knock your socks off For the birds All thumbs Jump the gun Driving me up the wall Bad Blood A good...

This is not used as much as it once was, but people will know what you mean if you use it; it's not obsolete.

chinese and french