Naar (נָעַר) means to shake violently — to shake out a garment, to shake off dust, to toss. It conveys a vigorous, decisive motion of separation or release. From this root comes naar (H5288, youth/boy, one who shakes off childhood) though that connection is debated.
Shaking off is a powerful prophetic gesture. Nehemiah 5:13 records Nehemiah shaking out the fold of his garment as a curse-warning: "In this way may God shake out of their house and possessions anyone who does not keep this promise." Jesus echoed this in Matthew 10:14 — shaking the dust from one's feet as a prophetic act of judgment-warning. Haggai 2:6 uses cosmic naar language: "Once more I will shake [raash] the heavens and the earth" — the eschatological shaking that leaves only what is unshakeable (Hebrews 12:26-28).
The shaking metaphor operates on multiple levels: household shaking (Nehemiah's curse-warning), cosmic shaking (Haggai's eschatology), and personal shaking off (Paul and Barnabas, Acts 13:51). What survives the shake is what truly belongs. The image of shaking out a garment — emptying it completely — underlies the prophetic gesture: nothing held back, nothing hidden. Hebrews 12 gives it its fullest theological expression: the unshakeable kingdom.