[with obj.](of a matter or subject) dominate or engross the mind of (someone) to the exclusion of other thoughts 占据(某人)思想;使(某人)心无二用 his mother was preoccupied with paying the bills. 他母亲满脑子想的是如何付账。 [as adj. preoccupied]she seemed a bit preoccupied. 她好像有点心事。
语源
mid 16th cent.: from pre- + occupy, suggested by Latin praeoccupare 'seize beforehand'