expression, noun
tough love; discipline out of love
Idiomatic expression referring to strict discipline or punishment given with good intentions, often in parenting, teaching, or coaching contexts.
先生の厳しい指導は愛の鞭だと思っている。
I believe the teacher's strict guidance is tough love.
親の叱るのも愛の鞭の一つだ。
A parent's scolding is also a form of tough love.
Compound of 愛 (love) + の (possessive particle) + 鞭 (whip). The phrase metaphorically compares strict discipline to a whip used out of love.