roundup n.

late 14c., rounden, "to make round, give roundness to," from round (adj.). Sense of "make a circuit round" is from 1590s. Sense of "bring to completeness" is from c. 1600; meaning "to approximate (a number)" is from 1934; with up or down, "to increase (or decrease) a number by adding to its last digit," by 1956. Meaning "turn round and face, turn on and assault" is from 1882. Related: Rounded; rounding.

Sense of "go past or get round" is by 1743. To round out "fill up" is by 1856. To round off is from 1680s as "make round, finish with a curved or rounded form;" by 1748 as "finish appropriately and neatly." Also compare roundup.

Old English up, uppe, from Proto-Germanic *upp- "up" (source also of Old Frisian, Old Saxon up "up, upward," Old Norse upp; Danish, Dutch op; Old High German uf, German auf "up"; Gothic iup "up, upward," uf "on, upon, under;" Old High German oba, German ob "over, above, on, upon"), from PIE root *upo "under," also "up from under," hence also "over."

As a preposition, "to a higher place" from c. 1500; also "along, through" (1510s), "toward" (1590s). Often used elliptically for go up, come up, rise up, etc. Up the river "in jail" first recorded 1891, originally in reference to Sing Sing, which is up the Hudson from New York City. To drive someone up the wall (1951) is from the notion of the behavior of lunatics or caged animals. Insulting retort up yours (scil. ass) is attested by late 19c.