mothball(n = noun.artifact) camphor ball - a small sphere of camphor or naphthalene used to keep moths away from stored clothing;
is a kind of ball, globe, orb
Derived form verb mothball₁

   mothball(v = verb.possession) - put into long-term storage;
is one way to store
Derived form noun mothball₁
Sample sentences: They mothball the cape

   A small sphere of camphor or naphthalene used to keep moths away from stored clothing. [WordNet 1.5]

   To put into long-term storage; as, to mothball the battleships not needed after the war. [WordNet 1.5]

mothball, n. & v.
--n. a ball of naphthalene etc. placed in stored clothes to keep away moths.
--v.tr.
1 place in mothballs.
2 leave unused.

Idiom:
in mothballs stored unused for a considerable time.