wave season
n.— «Selling her first cruise with America’s Vacation Center in December, Kier started during what is considered to be one of the slowest periods of the year. On the eve of what the cruise industry calls “wave season,” Kier managed to generate more than $20,000 in commissions in less than 30 days.» —“Travel agent sells more than $150,000 in her first month with America’s Vacation Center” in San Diego, Calif. PR Leap Jan. 10, 2006. (source: Double-Tongued Dictionary)
Further reading
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There are eight major planets, but more than a million minor ones, including asteroids. If you discover one, you get the honor of naming it. The Dictionary of Minor Planet Names includes minor planets named for rock bands, jazz musicians, poets, and...