“Substantial increase” in Japanese
Short answer
Substantial increase in Japanese is “大幅増” (oohabazou). Full meaning: substantial increase, large gain, huge increase.
Other ways to say “Substantial increase” in Japanese
高騰
koutou sharp rise (in prices), steep rise, substantial increase, soaring
昂騰
koutou sharp rise (in prices), steep rise, substantial increase, soaring
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