1.noun(usually in plural) A small ball of chemical pesticide (typically naphthalene) and deodorant placed in or around clothing and other articles susceptible to damage from mold or moth larvae in order to protect them from this damage.
2.verbTo store or shelve something no longer used.
"They mothballed the old version after the new one came out."
3.verbTo stop using (something), but keep it in good condition.