Wilson's Dictionary of Bible Types
Numbers 33:55 (b) The heart is located in the side of the breast, and the Lord was warning Israel that if they permitted the enemy to remain in the land, then these enemies would strike at their very lives, and wreck their existence. He promised them only trouble from the wicked men of the evil nations if they were not destroyed. (See Joshua 23:13; Judges 2:3).
Daniel 7:5 (b) The Medio-Persian empire is described as a bear. One side of the bear is the Kingdom of the Medes, and the other side is the Kingdom of the Persians. These two kingdoms were united against Babylon, but the side of the Medes was uppermost. represented by their King Darius.
Ezekiel 1:17 (b) In this peculiar expression, the Lord is informing us that the Lord JESUS CHRIST, who is represented by the four animals, and the Holy Spirit, who is represented by the eyes, would influence and affect every part of the earth. The Lord uses the expression "the four sides" and the expression "the four corners" to represent north, south, east and west. No part of the earth would be free from the influence of the Son of GOD, and the Spirit of GOD. (See Ezekiel 10:11).
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Watson, Walter. Entry for 'Side'. Wilson's Dictoinary of Bible Types. https://www.studylight.org/dictionaries/eng/wdt/s/side.html. 1957.