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3.02
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mainstay noun [ ˈmeɪnsteɪ ]

• a person or thing on which something else is based or depends.
• "farming is the mainstay of the rural economy"
Similar: central component, centrepiece, prop, linchpin, cornerstone, pillar, bulwark, buttress, chief support, backbone, anchor, foundation, base, bastion, tower of strength, key player, sinew, right-hand man/woman, right arm, Atlas,
• a stay that extends from the maintop to the foot of the foremast of a sailing ship.


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