expression, ichidan verb
make full use of; take full advantage of; rely on
Used when someone leverages a skill, experience, authority, money, or other resource to achieve something. Often implies that the resource is the decisive factor. The expression is a causative form of 物を言う (to speak; to be effective).
See also: 物を言う (ものをいう)
He made full use of his years of experience and overcame the difficult situation.
資金力を物を言わせて、ライバル会社を買収した。
They took full advantage of their financial power and acquired a rival company.
最後は体力を物を言わせて勝った。
In the end, he relied on his physical strength and won.