Couter

a sovereign. Half-a-couter , half-a-sovereign. From the Danubian-gipsy word cuta , a gold coin.

Rien ne lui coûte = He sticks at nothing; He spares no trouble.

Coûte que coûte = Cost what it may.

Coûter les yeux de la tête = To cost a small fortune, a fearful lot of money.