プログレッシブ和英中辞典(第4版)の解説
じょうじる【乗じる】
❶〔つけ入る〕take advantage of，《文》 avail oneself of；〔機会をとらえる〕seize ((an opportunity))
こちらの弱みに乗じて高く売りつけた
Taking advantage of our weakness [helpless situation], he forced it upon us at an exorbitant price.
彼はすぐ人に乗じられる
He is easily taken advantage of.／《口》 He is 「a sucker [an easy mark].
闇(やみ)に乗じて
under cover of darkness
相手の隙(すき)に乗じて攻撃した
We attacked them (at a moment) when they were off their guard.
❷〔掛算をする〕multiply ⇒かける（掛ける）Ⅱ⑬