Threaten - Vine's Expository Dictionary of New Testament Words
Threaten[ 1,,G546, apeileo ]
is used of Christ, negatively, in 1 Peter 2:23; in the Middle Voice, Acts 4:17, where some texts have the noun apeile in addition, hence the AV, let us straitly threaten," lit., "let us threaten ... with threatening" (See THREATENING). (See also STRAITLY.)
[ 2,,G4324, prosapeileo ]
"to threaten further" (pros, and No. 1), occurs in the Middle Voice in Acts 4:21.