Received Pronunciation, often abbreviated to RP, is an accent of spoken English. Unlike other UK accents, it's identified not so much with a particular region as with a particular social group, although it has connections with the accent of Southern England,RP is associated with educated speakers and formal speech.
The tapped T sound
When you’re listening to American English speakers you may have noticed that when the letter “t” is in the middle of a word it often has a /d/ sound.
Pronunciation teachers call this the flap or the tapped T sound. That’s because when we make this sound we slightly flap or tap our tongues behind the gum ridge of our upper teeth.
The tapped T sound is used all the time
American English speakers use the tapped T sound a lot. We don’t use the aspirated T sounds you hear in British influenced English.
When to use the tapped T sound
The tapped T sound is often used when when a T is between vowels as in the words:
party
forty
water
data
The tapped T sound is used when a T comes before a syllabic [l] as in the words:
petal
metal
settle
total
Say the Ts in the above words with a quick /d/ sound and your speech will sound more American.
Glossary
restrained - Someone who is restrained is very calm and unemotional.
In the circumstances he felt he'd been very restrained.
Livy thought Caroline's greeting seemed a little restrained.