mainstay

main|stay /m'eɪnsteɪ/ (mainstays)
[N-COUNT] usu the N of n
If you describe something as the mainstay of a particular thing, you mean that it is the most basic part of it.
Fish and rice were the mainstays of the country's diet...
This principle of collective bargaining has been a mainstay in labor relations in this country.

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