널뛰다 (neol-ttwida) To play the Korean traditional seesaw, literally "to jump on the plank".
널 뛰기 (neol-ttwigi) Korean acrobatic seesawing, or makeshift jumping on the plank.
널 판(板) (neol pan) The neol in native Korean is the same as the pan in Sino-Korean. Its compound neolpan regardless of the suffixes almost sounds like an anagram of panel. Perhaps it is needed to avoid confusion with the coffin.