Jamais
Au grand jamais = Never, no never.
Jambe
Il court à toutes jambes = He is running as fast as his legs will carry him.
[Compare: à toute bride, à toute vapeur, à toute vitesse.]
Il a pris ses jambes à son cou = He took to his heels.
Il a joué des jambes = He took to flight.
Il a des jambes de quinze ans = He still walks well.
Cela ne lui rend pas la jambe mieux faite! (ironic.) = And a lot of good that will do him!
Cela vous ferait une belle jambe (ironic.) = A fine lot of good that will do you.