What is the translation of "暗中观察.." in English?

The phrase "暗中观察.." translates colloquially to: "Peeking in the dark to watch someone...."

What does the word "暗" mean in this context?

In this phrase, "暗" (pronounced àn) means: dark, hidden

In this phrase, "中" (pronounced zhōng) means: in, during, inside

In this phrase, "观察" (pronounced guān chá) means: to observe, to watch carefully

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Peeking in the dark to watch someone....