Two more French phrases:
Il a avalé son parapluie :
Literally: He has swallowed his umbrella:
He is uptight (stiff and starchy).
S’entendre comme des larrons en foire :
Literally: To understand one another like thieves in the market:
To be as thick as thieves.
Taken from: ‘Don’t toss Granny in the Begonias: Faut pas Pousser Mémé dans les Bégonias’ par Marie-Hélène Claudel-Gilly et Primrose Arnander