Chinese name: 下午
Pinyin: xià wǔ
English name: afternoon
Characters: 下 is an ideogrammatic character which originally in oracle bones was a short horizontal line under a slightly longer line. Now the character simply means down.
The second character 午 was an image of a rice pounder in oracle bones. Now it simply means midday.
A literal translation of 上午 in English is down midday.