Envoyer
Je l’ai envoyé promener (or, fam., paître) = I sent him about his business.
Épée
C’est son épée de chevet = 1. That is his trusty counsellor. 2. That is what he is always talking about.
[Literally, a sword that hung at the head of a bed to guard one from nocturnal attacks.
“Voilà leur épée de chevet, de l’argent.”—Molière, L’Avare, iii. 5.]
Passer au fil de l’épée = To put to the sword.
Qui porte épée porte paix = One sword keeps another in its scabbard; Si vis pacem, para bellum.
Épervier
*Mariage d’épervier, la femelle vaut mieux que le mâle = The grey mare is the better horse.