Etymology
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mothball (n.)

also moth-ball, moth ball, "naphthalene ball stored among fabrics to keep off moths," 1891, from moth + ball (n.1).

mothball (v.)

1902 in a literal sense (to store away with mothballs), from mothball (n.); figurative sense "to lay up or disuse for a long time" is from 1901, popularized c. 1946 in U.S. in reference to warships at the end of World War II.

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Definitions of mothball
1
mothball (v.)
put into long-term storage;
2
mothball (n.)
a small sphere of camphor or naphthalene used to keep moths away from stored clothing;
Synonyms: camphor ball
From wordnet.princeton.edu