a straight temper line on a blade

(Classical Japanese, archaic) to pass; to go beyond / (Classical Japanese, archaic) to elapse; to exceed

nail, claw

(only in compounds) nail; claw

There is a claw in 瓜 (“melon”) but no claw in 爪 (“claw”): A phrase explaining the difference between the characters 瓜 (“melon”) and 爪 (“claw”).

stress-free

being stress-free

(idiomatic) to feel inferior, to feel small

the first sight of something / something seen for the first time

one should start a big project with immediate, practical steps; start small / the person who proposes something should be the first one to take practical steps to implement it