The treaty acted as a sustainer of peace between the two nations.
sustainer of hope
Frequency:
45
%
His words were a sustainer of hope for the struggling community.
sustainer of balance
Frequency:
35
%
Yoga is often seen as a sustainer of balance in one's life.
Idiomatic Expressions for sustainer
Phrase: mainstay
Meaning: a person or thing that acts as a chief support or part
Usage: He has been the mainstay of the company, serving as its sustainer during difficult times.