• noun:   failure to reach a minimum required performance

  Example: "His failing the course led to his disqualification"

• noun:   a flaw or weak point

  Example: "He was quick to point out his wife's failings"

• adjective:   below acceptable in performance

  Example: "Received failing grades"

• adjective:   unable to meet financial obligations

  Example: "A failing business venture"

• name:  A surname (very rare: popularity rank in the U.S.: #30453)

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