The data provided additional support for their claims.
strengthen
Frequency:
70
%
The additional evidence helped strengthen their argument.
reinforce
Frequency:
65
%
The feedback from the coach helped reinforce their skills.
fortify
Frequency:
50
%
The new security measures were put in place to fortify the building.
Idiomatic Expressions for buttress
Phrase: buttress a wall
Meaning: to reinforce or support a wall with a projecting structure
Usage: The engineers decided to buttress the old building's walls to prevent collapse.