Strong's Concordance

Original word: ἐπιδύω
Transliteration: epiduó
Definition (short): down
Definition (full): to set (of the sun)

NAS Exhaustive Concordance

Word Origin: from epi and dunó
Definition: to set (of the sun)
NASB Translation: go down (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

From epi and duno; to set fully (as the sun) -- go down.

see GREEK epi

see GREEK duno

KJV: Be ye angry, and sin not: let not the sun go down upon your wrath:
NASB: BE ANGRY, AND yet DO NOT SIN; do not let the sun go down on your anger,