To be under the aegis of an organization is to be sponsored or protected by them. For instance, you were under the aegis of the Peace Corps when you were living in Swaziland.

The noun aegis comes from the Greek word Aigis, which was the name of Zeus’s shield. That’s Zeus, the most powerful Greek god, who probably had a pretty tough shield, even though it was made of goatskin. To say that something or someone is under the aegis of another is basically saying that they have the strength of Zeus on their side. Or, at least, whoever is protecting them will be as Zeus-like as possible in their support.

Primary Meanings of aegis

armor plate that protects the chest; the front part of a cuirass
kindly endorsement and guidance
Full Definitions of aegis

n armor plate that protects the chest; the front part of a cuirass

breastplate, egis
a metal breastplate that was worn under a coat of mail
Type of:
armor plate, armor plating, armour plate, plate armor, plate armour
specially hardened steel plate used to protect fortifications or vehicles from enemy fire

n kindly endorsement and guidance

auspices, egis, protection
Type of:
endorsement, indorsement
the act of endorsing

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