ο  definite article - nominative singular masculine
ho  ho:  the definite article; the (sometimes to be supplied, at others omitted, in English idiom) -- the, this, that, one, he, she, it, etc.

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δε  conjunction
de  deh:  but, and, etc. -- also, and, but, moreover, now (often unexpressed in English).

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καυχωμενος  verb - present middle or passive deponent participle - nominative singular masculine
kauchaomai  kow-khah'-om-ahee:  to vaunt (in a good or a bad sense) -- (make) boast, glory, joy, rejoice.

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εν  preposition
en  en:  in, at, (up-)on, by, etc.

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κυριω  noun - dative singular masculine
kurios  koo'-ree-os:  supreme in authority, i.e. (as noun) controller; by implication, Master (as a respectful title) -- God, Lord, master, Sir.

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καυχασθω  verb - present middle or passive deponent imperative - third person singular
kauchaomai  kow-khah'-om-ahee:  to vaunt (in a good or a bad sense) -- (make) boast, glory, joy, rejoice.New American Standard Bible
But HE WHO BOASTS IS TO BOAST IN THE LORD.

King James Bible
But he that glorieth, let him glory in the Lord.

Holman Christian Standard Bible
So the one who boasts must boast in the Lord.

International Standard Version
"The person who boasts should boast in the Lord."

NET Bible
But the one who boasts must boast in the Lord.

Aramaic Bible in Plain English
But he who boasts, let him boast in THE LORD JEHOVAH.

GOD'S WORD® Translation
"Whoever brags should brag about what the Lord has done."

King James 2000 Bible
But he that glories, let him glory in the Lord.2 Corinthians 10:17
2 Corinthians 10:17 NIV
2 Corinthians 10:17 NLT
2 Corinthians 10:17 ESV
2 Corinthians 10:17 NASB
2 Corinthians 10:17 KJV