To go
bow'  (bo)
to go or come (in a wide variety of applications)

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into the clefts
nqarah  (nek-aw-raw')
cleft, clift.

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of the rocks
tsuwr  (tsoor)
a cliff (or sharp rock, as compressed); generally, a rock or boulder; figuratively, a refuge; also an edge (as precipitous)

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and into the tops
ca`iyph  (saw-eef')
a fissure (of rocks); also a bough (as subdivided) -- (outmost) branch, clift, top.

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of the ragged rocks
cela`  (seh'-lah)
a craggy rock, literally or figuratively (a fortress) -- (ragged) rock, stone(-ny), strong hold.

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for
paniym  (paw-neem')
the face (as the part that turns); used in a great variety of applications (literally and figuratively); also (with prepositional prefix) as a preposition (before, etc.)

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fear
pachad  (pakh'-ad)
a (sudden) alarm (properly, the object feared, by implication, the feeling) -- dread(-ful), fear, (thing) great (fear, -ly feared), terror.

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of the LORD
Yhovah  (yeh-ho-vaw')
(the) self-Existent or Eternal; Jehovah, Jewish national name of God -- Jehovah, the Lord.

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and for the glory
hadar  (haw-dawr')
magnificence, i.e. ornament or splendor -- beauty, comeliness, excellency, glorious, glory, goodly, honour, majesty.

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of his majesty
ga'own  (gaw-ohn')
arrogancy, excellency(-lent), majesty, pomp, pride, proud, swelling.

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when he ariseth
quwm  (koom)
to rise (in various applications, literal, figurative, intensive and causative)

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to shake terribly
`arats  (aw-rats')
to awe or (intransitive) to dread; hence, to harass -- be affrighted (afraid, dread, feared, terrified), break, dread, fear, oppress, prevail, shake terribly.

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the earth
'erets  (eh'-rets)
the earth (at large, or partitively a land) -- common, country, earth, field, ground, land, natins, way, + wilderness, world.New American Standard Bible
In order to go into the caverns of the rocks and the clefts of the cliffs Before the terror of the LORD and the splendor of His majesty, When He arises to make the earth tremble.

King James Bible
To go into the clefts of the rocks, and into the tops of the ragged rocks, for fear of the LORD, and for the glory of his majesty, when he ariseth to shake terribly the earth.

Holman Christian Standard Bible
They will go into the caves of the rocks and the crevices in the cliffs, away from the terror of the LORD and from His majestic splendor, when He rises to terrify the earth.

International Standard Version
They will enter caverns in the rocks and clefts in the cliffs, to escape the terror of the LORD and to escape the splendor of his majesty, when he arises to terrorize the earth.

NET Bible
so they themselves can go into the crevices of the rocky cliffs and the openings under the rocky overhangs, trying to escape the dreadful judgment of the LORD and his royal splendor, when he rises up to terrify the earth.

GOD'S WORD® Translation
They will go into caves in the rocks and into cracks in the cliffs because of the LORD's terrifying presence and the honor of his majesty when he rises to terrify the earth.

King James 2000 Bible
To go into the clefts of the rocks, and into the tops of the ragged rocks, for fear of the LORD, and for the glory of his majesty, when he arises to shake mightily the earth.Isaiah 2:21
Isaiah 2:21 NIV
Isaiah 2:21 NLT
Isaiah 2:21 ESV
Isaiah 2:21 NASB
Isaiah 2:21 KJV