occur/ə'kɜːr $ ə'kɜːr/

v. happen

➭pt., pp. & ing. -rr-

v.〈正式〉[I] 发生：The plane crash occurred yesterday morning. 飞机失事发生于昨天上午。

构词ac(=ob-) + cur (=run流动)

同根 currency; curriculum; excursion

辨析break out; happen; occur; take place