Meaning

verb tag the base runner to get him out

verb take into custody

verb seize suddenly

originFrom dialectal nap (“to seize, lay hold of”), probably of North Germanic origin, from Old Swedish nappa (“to pluck, pinch”). Related to Danish nappe (“to tweak, snatch at, catch, seize”), Swedish nappa (“to take, grab, pinch”), Norwegian Bokmål nappe (“to grab, snatch, pluck, yank”).

Etymology from Wiktionary, CC BY-SA 3.0