通とおりがかり

noun, noun which may take the genitive case particle 'no'

passing by; happening to pass

Refers to the act of passing by a place, often implying coincidence or being in the right place at the right time. Commonly used in the phrase 通りがかりに (while passing by).

• 通とおりがかりの人ひとが助たすけてくれた。