c. 1600, "one who educates or instructs," agent noun from train (v.). Meaning "one who prepares another for feats requiring physical fitness" is from 1823, originally of horse-trainers.
例文
1. The horse made a winning start for his new trainer .
この馬は新しい調教師のために良い頭を開いた。/
2.The tennis star has parted company with his Austrian trainer .
このテニススターはオーストリアのコーチと別れた。
3.She went to the gym with her trainer .
彼女はコーチと一緒にジムに行った。
4.Our trainer had a strong influence on the team.
私たちの監督はこのチームに大きな影響を与えています。
5.Her trainer was even more gloomy about the prospects for British tennis.