roller
n.— «I reined in the speedy pace and tried to find a rhythm over the first three miles, where we encountered “rollers”—in running parlance, those are mellow hills with ups and downs that wake up your legs, but aren’t so challenging that they leave you breathless.» —“Oh deer! Hills and more at the March Madness Half Marathon” by Liz Plosser Time Out Chicago Mar. 16, 2009. (source: Double-Tongued Dictionary)
Further reading
If someone urges you to spill the tea, they probably don’t want you tipping over a hot beverage. Originally, the tea here was the letter T, as in “truth.” To spill the T means to “pass along truthful information.” Plus...
When you had sleepovers as a child, what did you call the makeshift beds you made on the floor? In some places, you call those bedclothes and blankets a pallet. This word comes from an old term for “straw.” And: What’s the story...