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MoniqueMaRie
Post by MoniqueMaRie »
I found both and don't know if the one in singular or in plural is more commonly used:
mettre les pieds dans le plat / mettre le pied dans le plat
Literally (plural): to put the feet in the dish
Meaning: to be a bit to blunt; the speaker may not realize that his/her bluntness is inappropriate; to say something that is inappropriate in a particular society or a particular context
(I found some explanations on the web; the best (I think) in "Lawless French")
Native 
/ using 
/ learning 
/ once learnt 
/ trying to understand at least a bit 
Post by Saperlipopette! »
I like Johan's podcast on that idiomatic expression from Mai 2017. It's about ten minutes.
Française Authentique
Mettre les pieds dans le plat