1.
erosion
The gradual wearing away of rock, soil, or land by natural forces such as water, wind, or ice.
海岸が侵食されている。
The coastline is being eroded.
長年の風雨による侵食で地形が変わった。
The terrain changed due to years of erosion from wind and rain.
河川の侵食作用によって渓谷が形成された。
The gorge was formed by the erosive action of the river.
2.
encroachment, erosion (figurative)
The gradual intrusion into or wearing away of someone's territory, rights, market share, or similar abstract domains.
シェアを侵食される。
To have one's market share eroded.
プライバシーが徐々に侵食されつつある。
Privacy is gradually being encroached upon.
新しい技術が既存の市場を侵食している。
New technology is eroding the existing market.
USAGE:
Used as a する verb: 侵食する. Both literal (geological) and figurative uses are common. The passive form 侵食される (to be eroded) is very frequent.
ETYMOLOGY:
侵 (to invade) + 食 (to eat/consume). The image of something gradually being eaten away.
COMMON COLLOCATIONS:
- 海岸侵食: coastal erosion
- 侵食作用: erosive action
- シェアを侵食する: to erode market share