Letter Uu!
Big U, little u!

"It’s raining. We need an umbrella."

"Uncle! Uncle! Do you have an umbrella?"
"Uh-huh. Uh-huh. Yes, I do."

"Uncle! Uncle! We need an umbrella."
"Uh-huh. Uh-huh. Come under my umbrella."

uncle
umbrella

"Uncle! It’s nice under the umbrella."
"Uh-huh. Uh-huh. Yes, it is."

"Uncle! Uncle! Where are we going?"
"Uh-oh! We’re going up, up, up!"

under
up

/u/ is the sound of Uu.