 
<translate> Akụkụ ahụ dị n'elu bụkarị akụkụ ahụ nke na-abịa n'elu waist. Ogwe aka na-abịa n'okpuru elu ahụ. Ya mere, azịza ya bụ ogwe aka. <eng> Upper body is generally the part of the body that comes above the waist. Arm comes under the upper body.
So, the answer is arm. 