What would you do if something unexpected happened?
Tips
memory
Not (不) + measure/predict (测) = the unmeasurable, the unpredictable. Something you cannot foresee.
register
不测 is literary/formal. Common collocations: 以防不测 (just in case), 发生不测 (mishap occurs), 天有不测风云 (the weather is unpredictable -- proverb about life's uncertainties).
