from an unused root meaning to depress; abasement; Tochu, an Israelite; Tohu.
Usages throughout the bible
1 Samuel 1:1
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Now there was a certain man of Ramathaimzophim, of mount Ephraim, and his name was Elkanah, the son of Jeroham, the son of Elihu, the son of Tohu, H8459 the son of Zuph, an Ephrathite: