a brief increase, as in business activity or political popularity
Explanation
Not every surge is big enough to qualify as a full-blown boom — and that's where boomlet comes in. A boomlet is a brief increase, particularly in business activity or political popularity. The word is a diminutive form of "boom," giving it a sense of a smaller or more temporary burst of enthusiasm. A boomlet shows that even a short-term boost can make an impression.
Example: Local retailers enjoyed a brief boomlet in sales during the holiday weekend.