accident vs stroke of ill luck

accident

adj
  • Designating any form of transportation involved in an accident. 

noun
  • Any property, fact, or relation that is the result of chance or is nonessential or nonsubstantive. 

  • A person born from an unintended pregnancy. 

  • A collision or crash of a vehicle, aircraft, or other form of transportation that causes damage to the transportation involved; and sometimes injury or death to the transportation's occupants or bystanders in close proximity. (but see Usage notes) 

  • A property attached to a word, but not essential to it, such as gender, number, or case. 

  • An instance of incontinence. 

  • An unexpected event with negative consequences occurring without the intention of the one suffering the consequences, and (in the strict sense) not directly caused by humans. 

  • Chance; random chance. 

  • Urine or feces excreted due to incontinence. 

  • An irregular surface feature with no apparent cause. 

  • A sudden discontinuity of ground such as fault of great thickness, bed or lentil of unstable ground. 

  • A point or mark which may be retained or omitted in a coat of arms. 

  • An unintended pregnancy. 

  • Any chance event. 

  • casus; such unforeseen, extraordinary, extraneous interference as is out of the range of ordinary calculation. 

stroke of ill luck

How often have the words accident and stroke of ill luck occurred in a corpus of books? (source: Google Ngram Viewer )