shikkari
Describes doing something properly and firmly, with full attention and responsibility. Also used to encourage someone to pull themselves together.
💡A parent encouraging a child — 'Shikkari hold on to the railing!'
しっかり勉強しなさい。
Study shikkari and do it properly.
You need to ___ prepare before the big presentation.
大事なプレゼンの前に○○準備しなさい。