shield >> /ʃild/
Definition: [verb] Protect (someone or something) from a danger, risk, or unpleasant experience.
Example: he pulled the cap lower to shield his eyes from the glare
Definition: [noun] A broad piece of metal or another suitable material, held by straps or a handle attached on one side, used as a protection against blows or missiles.
Example: Patrick whipped out his new shield and the shield defended against the blow.
Definition: [noun] A person or thing providing protection.
Example: a protective coating of grease provides a shield against abrasive dirt
Definition: [noun] A large rigid area of the earth's crust, typically of Precambrian rock, which has been unaffected by later orogenic episodes, e.g. the Canadian Shield.
Example: Their principal outcrops constitute the great Precambrian shields of continental crust upon which later formations were deposited.