- a harbor near Honolulu, on S Oahu, in Hawaii: surprise attack by Japan on the U.S. naval base and other military installations December 7, 1941.
- any significant or crippling defeat, betrayal, loss, etc., that comes unexpectedly.
- an almost landlocked inlet of the Pacific on the S coast of the island of Oahu, Hawaii: site of a US naval base attacked by the Japanese in 1941, resulting in the US entry into World War II
