bander

To bind or bandage tightly (bander une plaie), and, more abstractly, to tense or draw taut (bander un arc, bander ses muscles) — hence les yeux bandés, blindfolded. In vulgar slang, bander also means to have an erection, so context matters.

• L'infirmière lui a bandé le bras. — The nurse bandaged his arm.
• L'archer bande son arc avant de tirer. — The archer draws his bow before shooting.
• On lui a bandé les yeux pour le jeu. — They blindfolded him for the game.

Because of the vulgar slang sense, learners should be a little cautious using bander casually outside its literal 'bandage/tense' meaning — a clear medical or physical setting keeps it unambiguous.