What does 俗 mean?
俗 is a Japanese noun meaning “the worldly, the secular” in English. It can also be translated as “common, popular” depending on context. It is written as 俗 in kanji, ぞく in hiragana, and zoku in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
ウチは俗に言うシングルマザーの家庭だ。父親の顔を僕は知らない。
We're what they colloquially call a single mother family. I haven't seen my father's face.