杓子定規、しゃくし定規
しゃくしじょうぎ
shakushijougi
JMdict entry #1324160
- adjectival nouns or quasi-adjectives (keiyodoshi)noun (common) (futsuumeishi) yojijukugo strict; hidebound; inflexible; being a stickler for the rules; sticking hard and fast to the rules