noun
one's high school days; high school years
Refers to the period of time when someone was a high school student. Often used in nostalgic or biographical contexts.
高校時代の友達と久しぶりに会った。
I met a friend from my high school days for the first time in a while.
彼は高校時代、野球部に所属していた。
He belonged to the baseball club during his high school years.
Compound of 高校 (high school) and 時代 (era, period).