trample
跆 centers on the act of trampling or stepping heavily on something, conveying forceful, downward pressure with the foot.
跆 is a phono-semantic compound: the foot radical 足 indicates the meaning related to the foot or stepping, while 台 likely provides the sound. The exact historical development is uncertain, but this structure is typical for characters describing actions involving the foot.
The left side is the foot radical 足, and the right side is 台 (a platform). Imagine a heavy foot stomping down onto a platform, trampling it with force.
For タイ, picture a tie (ネクタイ) lying on the ground being trampled by a foot: tie -> タイ, and the foot stomps on it.