also: サイド・ビジネス
noun
side business; side job
A job or small business done in addition to one's main work. Compared with 副業, this katakana word can sound a little more business-like or entrepreneurial.
会社員をしながらサイドビジネスを始めた。
I started a side business while working as a company employee.
彼女は週末にサイドビジネスでアクセサリーを
She sells accessories as a side business on weekends.