An ornamental ridge, as on top of a wall or roof.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "cresting" in a sentence
"They were lazily gliding through the water, or sleeping on the sandy bottom, and one shark was kind enough to show off its Jaws” dorsal fin cresting the surface of the water” impression."
"And St. Louis, you're kind of cresting now, but you're going to hold steady there for days to come."
"It's a wave of violence that's cresting along with a tide of hateful, insurrectionist rhetoric that far too many conservatives refuse to condemn."