[intransitive, transitive] stack (sth) (up) to arrange objects neatly in a pile; to be arranged in this way被放成整齐的一堆（或一摞）◆The boxes are stacked up in the warehouse.那些箱子整齐地堆放在仓库里。◆These containers stack for easy transport.这些集装箱堆放齐整以便运输。 [transitive] to fill sth with piles of things堆积；码放◆staff stacking shelves in the supermarket码放货物的超市员工  ➡  shelf-stacker ●ˌstack ˈupto keep increasing in quantity until there is large pile, a long line, etc. waiting to be dealt with积聚成一大堆（或一长排等）◆The work stacks up when you are away for a few days.你不在的这几天攒了一大堆工作。●ˌstack ˈup (against sb/sth) (used especially in questions or negative sentences 尤用于疑问句或否定句) to compare with sb/sth else相比；比得上◆How does their latest model stack up against ours?他们的最新款式与我们的相比如何？◆Let's test them both and see how they stack up.让我们把两个都测试一下看看哪个更好。