in the first flush

in the first flush of (something)

In the earliest of beginning stages, especially when energy, effort, or enthusiasm are at their peak. Of course they're happy now—they're still in the first flush of marriage! Let's see how they're doing ten years down the line. The novel consists of parallel storylines: one follows the protagonist in the first flush of adulthood, while the other examines how his views have changed after a lifetime of experience and hardship.
See also: first, flush, of

in the first flush

in a state of freshness and vigour.
The exact origins of flush as a noun are unknown; early senses share the idea of a sudden rush or abundance of something (e.g. water, growth of grass, or emotion).
1997 Tom Petsinis The French Mathematician A month ago, in the first flush of enthusiasm…I tackled the classic problem of trisecting an angle using only a compass and straightedge.
See also: first, flush
References in periodicals archive ?
The results on the number of pileus per flushing was, in the first flush no significant difference, second flush no significant difference, third flush and the fifth flush no significant difference from each treatment.
The highest number of pileus in the first flush is in treatment 1 (6x12) with a mean of 8 pileus per bag per flushing, followed by treatment 3 (8x12) with 7.
The highest treatment mean for the length of stipe or stem in the first flush is treatment 3 (8x12) got the highest with a mean of 26.
The highest treatment mean of the diameter in the first flush is treatment 1 (6x12) with a mean of 45.