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第一線 (daiissen) Japanese meaning: front line | Kotomora
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いっ
線せん
で
働はたら
い
て
き
た
。
He has worked on the front lines of medical care for many years.
That researcher is at the forefront of AI research.
Usage patterns 第だい 一いっ 線せん で 活かつ 躍やく する to be active at the forefront (of a field)
He is still active at the forefront of medicine.
第だい 一いっ 線せん から 退しりぞ く to retire from the front line/forefront
She retired from the forefront of her career at age fifty.
第だい 一いっ 線せん に 立た つ to stand at the forefront
He always stands at the forefront of research.
第だい 一いっ 線せん を 守まも る to hold/defend the front line
The soldiers kept defending the front line.
Related words 最前線 is the literal, physical front of a battlefield or crisis, while 第一線 is broader and often figurative, referring to the leading edge of any field of activity.
最先端 emphasizes being on the cutting edge of technology or trends, while 第一線 emphasizes being actively engaged at the forefront of a profession or effort.
Etymology Compound of 第一 (first) and 線 (line), literally 'first line'. The term originally referred to the foremost line of troops in battle and later extended to mean the forefront of any endeavor.
