食い下がる

What does 食い下がる mean in English?

1. to hang on to; to hang from; to cling to(v5r, vi)
2. to hound; to keep after (someone); to refuse to back down; to persist; to tenaciously face (someone); to doggedly oppose(v5r, vi)
3. to grab the front of the opponent's mawashi, place one's head against their chest, and lower one's hips(v5r, vi)