A fiery spell from Chris Morris (2-18) late in the game inspired a tremendous South African fightback that ended in a three-run victory over England off the last ball.
England were on track for a win at 132-2 in the 16th over, when the controversial dismissal of Jason Roy (67) for obstructing the field caused them to slip behind the required run rate. Dawson needed to hit a 4 off the last ball to win the game but failed to connect with a yorker from Phehlukwayo.
Earlier, Tom Curran impressed on debut -as he finished with 3-33 from his four overs. J J Smuts (45) and A B de Villiers (46) got South Africa to 174-8.
The 3 match series is tied at 1-1.
South Africa 174 for 8 (Smuts 45, de Villiers 46, Curran 3-33) beat England 171 for 6 (Roy 67, Morris 2-18) by three runs.
Matches Tagged in ClipDex2017 ENG v RSA 2nd T20
Series Tagged in ClipDex2017 ENG v RSA T20 series
Players Tagged in ClipDexButtler, Joseph Charles Billings, Samuel W Livingstone, Liam S Mosehle, Mangaliso Morkel, Morne Willey, David J Shamsi, Tabraiz Jordan, Chris J Behardien, Farhaan Bairstow, Jonathan M Morris, Christopher H Roy, Jason J Dawson, Liam A Phehlukwayo, Andile Paterson, Dane Curran, Thomas K de Villiers, Abraham B
Grounds Tagged in ClipDexTaunton County Ground
Categories Tagged in ClipDexLimited Overs (ODI & T20)