Usage: 1 form in 1 verse
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καθύμνουν they sang praise LXX.2Chr.30.21

Liddell-Scott-Jones

καθυμνέω (kathumneō) to sing praise G:V

καθυμνέω,

sing of much or constantly, descant upon,[Refs 5th c.BC+]; make a hymn of, τὸν αὑτῶν βίον [Refs 4th c.BC+]