…to move with a sinuous or wavelike motion; display a smooth rising-and-falling or side-to-side alternation of movement:
The flag undulates in the breeze.

This is our flagpole in our yard with our favorite flags undulating.
And here’s the U.S. Flag, Old Glory, undulating on top of the Space Needle in Seattle.
And from our favorite country to visit here’s the Union Jack undulating in the breeze!
I’m linking to ABC Wednesday started by Mrs. Nesbitt and carried on by Roger and a great team!
Hope all is well in your corner of the world.
Now that is a word that is not part of my vocabulary. Well illustrated!
Undulate reminds me of snakes and belly dancers!
Oh yes, my favorite country to visit too! :-)) nice photos.
Oh I just came from a blog where she just painted Union Jack on one of her doors and it is soooooooo cute…:)
Very good U word.
My ABC WEDNESDAY
Mrs. T. Potts has some cute teapots in her pretty shop window. I have never thought of flags undulating, but in certain breezes, they certainly do.
Great “U” post Ellen! Love the Mrs. T. Potts picture!
What do you know? I learned a new word! It does not sound like what it means.
I knew the verb in Spanish, which is “ondular,” but don’t recall hearing it in English before. Blessings!
Where we are staying in Anglesey the roads UNDULATE like a fairground ride!
best wishes,
Di.
ABCW team.
Undulating roads are very rare in my country, but we have a lot of undulating waves in the sea bordering our country. Sometimes it undulates too much!!
Have a great week.
Wil, ABCW Team
nice theme you’ve chosen, and beautiful pictures to go with it !
I love words and especially words not used everyday. Thanks for illustrating undulate with flags – brilliant idea. Undulate is fun to say, too!
Terrific examples of your uber fine word♪