grind down
中高级 (B2) neutral
To slowly crush or tire someone out through pressure, or to make something smaller by rubbing it against a hard surface.
"He used a file to grind down the sharp edge of the metal bracket."
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How The Iran War is Becoming a World War
RealLifeLore · 2:06
to grind down Iran's military
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Timeline - World History Documentaries · 72:03
to grind down the assault which they
Early Muslim Expansion Explained in 8 Hours - From Yarmouk to Tours
Kings and Generals · 246:36
just a delaying action which only served to grind down