These days, people are stacking up to see the last of autumn's vibrant colors.
These samples are biased, stacking the deck in favor of a connection between mental disorder and violence.
They are clearly trying to take over the Armed Forces by stacking its junior cadres with their own members.
c.1300, "pile, heap, or group of things," from Old Norse stakkr "haystack" (cf. Danish stak, Swedish stack "heap, stack"), from Proto-Germanic *stakkoz, from PIE *stognos- (cf. Old Church Slavonic stogu "heap," Russian stog "haystack," Lithuanian stokas "pillar"), from root *steg- "pole, stick" (see stake (n.)). Meaning "set of shelves on which books are set out" is from 1879. Used of the chimneys of factories, locomotives, etc., since 1825.