mainstay

/ˈmeɪn.steɪ/

Misollar

He was the mainstay of this family.
Tourism has become the mainstay of the economy.
Food production is a mainstay of the country's economy.

ot noun

A chief support. Agriculture is the mainstay of this country’s economy.
Someone or something that can be depended on to make a regular contribution.
A stabilising rope from the top of the mainmast to the bottom of the foremast.

Manbalar: Wiktionary (Free Dictionary API orqali), Datamuse, Tatoeba (CC BY 2.0 FR), MyMemory.