noun

shield

Translation

shield, protection, guard

The knight carried a sword and a shield.

The ozone layer is a shield against the sun.

He shielded his eyes from the bright light.

((a shield)) ((against sth.)) a protective object against (sth.) The riot police held up their shields.

((to shield)) ((sb./sth.)) ((from sth.)) to protect (sb./sth.) from (sth.) She shielded her eyes from the bright light.

guard, protection, barrier, defense

From Old English 'scield', meaning 'board' or 'protection'.

Picture a superhero's shield deflecting attacks. Note that 'shield' is also a verb meaning 'to protect'.