What should a player do if they want to tackle a character?

@JeremyECrawford I was wondering what should a player do if they want to tackle a character? Or at the very least barrel into a foe for dmg?

— Haka (@Hakasami) April 2, 2017

Tackling someone? Use one of these options, depending on your goal:

Unarmed strike
Grappling
Shoving

See Player's Handbook, p. 195. #DnD https://t.co/VdGxV1D1Gc

— Jeremy Crawford (@JeremyECrawford) April 3, 2017