キョウ, コウ, せま.い, せば.める, せば.まる, さ

narrow, contract, reduce, tight, limited

JLPT0 G13 S0 F5000

As per # (pressed between) + dog/beast → be pressed on by wild animals, with nowhere to turn → *narrow* (← narrow margin for escape) → *small*; *reduce*; *narrow-minded*.

[Full Kanji Etymology List]