Spurt: a short, sudden burst. A short spray of water from a garden hose could be a &quot;spurt&quot;. We use the phrase &quot;growth spurt&quot; to describe when a child grows taller in a short time.<p>They&#x27;re using it to describe a short, relatively large transfer of accumulated data collected while the wifi connection is deactivated, and transferred in a sudden stream when it&#x27;s turned on.