|Easton's Bible Dictionary|
Fear on every side, (Jeremiah 20:3), a symbolical name given to the priest Pashur, expressive of the fate announced by the prophet as about to come upon him. Pashur was to be carried to Babylon, and there die.
Int. Standard Bible Encyclopedia
ma'-gor-mis'-a-bib (maghor miccabhibh, "terror on every side"): A name given by Jeremiah to Pashhur ben Immer, the governor of the temple, who had caused the prophet to be beaten and set in the stocks (Jeremiah 20:3). The same expression is used (not as a proper name) in several other passages (Psalm 31:13 Jeremiah 6:25; Jeremiah 20:10; Jeremiah 46:5; Jeremiah 49:29 Lamentations 2:22).
Magormissabib (1 Occurrence)
Jeremiah 20:3 It happened on the next day, that Pashhur brought forth Jeremiah out of the stocks. Then said Jeremiah to him, Yahweh has not called your name Pashhur, but Magormissabib. (WEB KJV JPS)