In order to track temporal hours during the day, inventors created sundials, which indicate time by the length or direction of the sun's shadow.

为了在白天追踪时间，发明家发明了日晷，它通过太阳阴影的长度或方向来指示时间。

youdao

A five o'clock shadow is facial stubble. It sometimes describes a man's beard at the end of the day.

Five o'clock shadow是指胡子，就是男生一天下来，到下午五点就会长出来的一点点胡子。

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the sky day by day I lose sight of my true being in its dark shadow.

当这道围墙一天天高起接天的时候， 在它黑暗的阴影中，我已看不见真实的自己。

youdao

Monday was Groundhog Day and it seems that the famous animal in Pennsylvania,Punxsutawney Phil,saw his shadow.

VOA: special.2009.02.03

So, on the day of the test, we will have a shadow rooms.

在测试的那天，我们会去到幽静的教室。

麻省理工公开课 - 固态化学导论课程节选

"Oh,sure,we shadow Firefly. We shadow him all day." "What day was that?"

VOA: special.2009.07.19

He has indicated that his party's atavistic defence of hereditary peers in the House of Lords may now be reconsidered: good, though it might carry more conviction if he had not held his two-day shadow cabinet summit this week on the estate of one of them, Lord Cranborne.

ECONOMIST: Too little Hagueography

So the doc introduced Jeff to a sales rep, who agreed to let Jeff shadow him for a day (follow him around).

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With thousands of "followers" caring enough to take time from their own day to shadow you through yours, is it any wonder that the followed are getting big heads as they "tweet" what they had for breakfast?

CNN: Commentary: Joe, Kanye, Serena -- aren't they special?