an idiom means you are very interested in something ,spend much time on it , but sometimes it's not good for you , it makes you don't have any goal or dream in your life~~ for example, a Chinese boy likes playing computer games very much, forgets studying,,then his father will say “你不能再玩物丧志了，多花点时间看看书吧！”

字面意思是只知道玩啦，丧失了远大的志向。

1.riding a hobby saps one's will to make progress; excessive attention 2.to trivia saps the will; to be a playboy without ambitions; to sap one's spirit by seeking pleasures

Excessive preoccupation with trivia saps the will

it means u spend all time on playing which is no use for yourself,and u do nothing.