You can buttress an argument with solid facts or your financial portfolio with safe investments. You may find that giving compliments to everyone you meet buttresses your popularity. To buttress is to sustain or reinforce.

A buttress is a structure that adds stability to a wall or building, and this innovation played a significant role in the evolution of architecture. Think of a medieval cathedral. It's an incredibly tall, open building filled with light from vast windows. Without buttresses supporting the walls and carrying the weight of the ceiling away from the building and down to the ground, this cathedral would be impossible. Picture this when you use buttress figuratively as a verb meaning to strengthen and support.

Definitions of buttress

n a support usually of stone or brick; supports the wall of a building

arc-boutant, flying buttress
a buttress that stands apart from the main structure and connected to it by an arch
Type of:
supporting structure that holds up or provides a foundation

v reinforce with a buttress

Buttress the church”
Type of:
reenforce, reinforce
make stronger

v make stronger or defensible

buttress your thesis”
Type of:
beef up, fortify, strengthen
make strong or stronger

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