Translation of "Untie" in French

I can't untie this knot.

Je ne parviens pas à défaire ce nœud.

The first thing he did was to untie his shoelaces and take his shoes off.

La première chose qu'il a faite, c'est détacher ses lacets et enlever ses souliers.

- The hands trying to untie the knots / the ribbons speckled on the forehead / of poisonous spit, horrendous cries / he goes vibrating, making the air pulsate.
- Both hands are labouring the fierce knots to pull; / black gore and slime his sacred wreaths distain. / Loud are his moans.

Lui, dégouttant de sang, souillé de noirs poisons, / qui du bandeau sacré profanent les festons, / raidissant ses deux bras contre ces nœuds terribles, / exhale sa douleur en hurlements horribles.