La langue lui a fourché = He made a slip of the tongue.
Lanterne
Il veut nous faire prendre des vessies pour des lanternes = He would have us believe that the moon is made of green cheese.
Large
Prendre le large = To run for the offing (nav.); To run away.
Au large = In the open sea. (See [Plein].)
Larron
Ils s’entendent comme larrons en foire = They are as thick as thieves.
*L’occasion fait le larron = Opportunity makes the thief; Keep yourself from opportunities and God will keep you from sins.