mainstay
Noun
Meaning
The stay extending from the foot of the foremast to the maintop.
Main support; principal dependence.
Source: Webster's dictionarySynonyms
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Examples
faith is his anchor
the keystone of campaign reform was the ban on soft money
he is the linchpin of this firm
he is a pillar of the community
Americans of all demographic groups want to keep turkey as the mainstay of Thanksgiving dinner, though Americans under 30 are less likely than older Americans to prefer it.
As a businessperson, you’d do well to use industry best practices to act as the mainstay of your advertising effort.