プログレッシブ和英中辞典(第4版)の解説
ざつがく【雑学】
(shallow) knowledge on a wide variety of subjects
私は雑学ばかりでこれといった専門がありません
《文》 I have only a smattering of knowledge about this and that [I know a little about various things], but I'm not a specialist in anything.
あの人は雑学の大家だ
He knows something about everything.