A spurt is a sudden and short period of increased activity, effort, or speed. It can refer to a sudden burst of energy, activity, or growth. Here are some examples of how the word "spurt" is used:

• "There was a sudden spurt of activity in the housing market".
• "He tends to work in spurts".
• "A sudden gushing or shooting forth; jet".
• "A marked increase of effort for a short period or distance, as in running, rowing, etc.".

Overall, "spurt" can refer to a sudden and brief increase in activity or effort, or a sudden burst of liquid or energy.