past participle of beat.

source: [ゴンとキルアがエレベーターガールに殴られてボコボコになっているGIF画像｜無料GIF画像検索 GIFMAGAZINE 149169]

1. having been defeated:

打ち負かされた

e.g. I knew when I was beaten.

exhausted and dejected:

疲れ果てた〈人など〉

e.g. he sat feeling old and beaten.

2. having been beaten or struck:

(むちで)打たれた〈人〉

e.g. he trudged home like a beaten dog.

3. (of food) whipped to a uniform consistency:

よく泡立てた〈卵など〉

e.g. beaten eggs.

(of metal) shaped by hammering, typically so as to give the surface a dimpled texture.

打ち延ばされた〈金属〉

(of precious metal) hammered to form thin foil for ornamental use.

4. (of a path) well trodden; much used.

踏み固められた〈道など〉

off the beaten track (or off the beaten path)

in or into an isolated place.

unusual:

e.g. as adjective : off-the-beaten-track experiences.