צָלַלtsâlal

be or grow dark

Pronunciation: tsaw-lal' · Hebrew/Aramaic (Old Testament) · H6751

Meanings

Qal: the gates of Jerusalem grew dark (Nehemiah 13:19)

Hiph`il: a shadowing wood (Ezekiel 31:3)

Same root

צֶלֶםtselem · H6754a phantom, i.e. (figuratively) illusion, resemblance; hence, a representative figure, especially an idol
מְצֻלָּהmᵉtsullâh · H4699shade
צֵלtsêl · H6738shade, whether literal or figurative
צֵלֶלtsêlel · H6752shade

Where it appears

Appears 2 times in the Bible.

Nehemiah 13:19 Then I commanded that the gates of Jerusalem should be shut as darkness fell every Friday evening, not to be opened until the Sabbath ended. I sent some of my own servants to guard the gates so that no merchandise could be brought in on the Sabbath day.
Ezekiel 31:3 You are like mighty Assyria, which was once like a cedar of Lebanon, with beautiful branches that cast deep forest shade and with its top high among the clouds.

Source: Brown, Driver and Briggs, Hebrew and English Lexicon of the Old Testament (1906), public domain; markup by unfoldingWord, CC BY (github.com/unfoldingWord/Brown-Driver-Briggs-Enhanced).