What is the meaning of "the light of day"?
What is the meaning of "the light of day" in sentences?

These negative ideas will sometimes be expressed in the light of day.

I often come across some words consecutively like a phrase
― I have the case that there aren't phrases like sentences above―that I dis-understand,
Do you recommend how to look up some words?

Thanks in advance.

Question

What is the meaning of "the light of day"?
What is the meaning of "the light of day" in sentences?

These negative ideas will sometimes be expressed in the light of day.

I often come across some words consecutively like a phrase
 ― I have the case that there aren't phrases like sentences above―that I dis-understand,
Do you recommend how to look up some words?

Thanks in advance.

Answer

Five points:

"In the light of the day" means after we have examined it further and carefully. It comes from the idea of something being more clearly seen with light shining in it.

"In the cold light of the day" means something similar, but emphasizes that you are examining the situation without emotion.

"It will never see the light of the day" means it will never happen.

You can google the phrases and usually find a good definition.

"Dis-understand" is not a word. Say, "don't understand."

Answer

Light of day =   ...by comparison to objective knowledge.