シ, さ.す, さ.さる, さ.し, さし, とげ

thorn, pierce, stab, prick, sting, calling card

JLPT2 G7 S8 F1031

As per # (stab) + sword/knife → *stab*; *stick*; *pierce*; *prick*; *sting*.

[Full Kanji Etymology List]