一点一画もおろそかにしない（いってんいっかくもおろそかにしない）

Japanese vocabulary

Meaning: always dot the i's and cross the t's; don't neglect the slightest detail; be punctilious

See it used in real works

• Example sentences from Japanese novels & web fiction (Massif)
• Hear “一点一画もおろそかにしない” pronounced in real videos (YouGlish)