Lexical Definition

‎שִׁלְשׁוֹם‎ shilshôwm (shil-shome') three days ago H:N
or שִׁלְשֹׁם shilshôm (shilshome'); from the same as ‎שֶׁלֶשׁ‎

[phrase] before (that time, -time), excellent things (from the margin), [phrase] heretofore, three days, [phrase] time past.

1) day before yesterday, three days ago
1a) an idiom for 'heretofore in times past'

See Greek: ἡμέρα

Usage: 11 forms in 24 verses
Form Translated As     In Verse(s)
שִׁלְשׁ֗וֹם three days ago 2Sam.5.2 • 1Chr.11.2
שִׁלְשׁ֖וֹם three days ago Josh.4.18
שִׁלְשׁ֔וֹם three days ago 1Sam.10.11 • 1Sam.14.21
שִׁלְשׁ֑וֹם third day Deut.4.42
שִׁלְשֽׁוֹם third day Deut.19.6 • Josh.20.5
three days ago Gen.31.2 • Josh.3.4 • Ruth.2.11 • 1Sam.19.7 • 2Kgs.13.5
שִׁלְשֹׁם֙ three days ago Exod.5.8
שִׁלְשֹׁ֗ם three days ago Exod.21.29
שִׁלְשֹׁ֔ם third day 2Sam.3.17
three days ago Exod.5.14 • Exod.21.36 • 1Sam.21.5
שִׁלְשֹׁ֑ם three days ago Gen.31.5 • Exod.5.7
שִׁלְשֹֽׁם third day Deut.19.4
three days ago 1Sam.4.7
מִשִּׁלְשֹׁ֔ם from three days ago Exod.4.10

Brown-Driver-Briggs

Also see: שָׁלִישׁ

‎שִׁלְשֹׁם‎ and (less often) ‎שִׁלְשׁוֺם‎25 adverb = three days ago, specifically day before yesterday (Köii. 1. 255 f. LagBN 20 Anm. BaNB § 216 b); — in phrase ‎׳‎‎תְּמוֺל שׁ‎ Exod 5:8 yesterday (and) day before, idiomatic for hitherto, so Ruth 2:11, ‎׳‎‎אֶתְמוֺל שׁ‎ 1Sam 4:7 ‎׳‎‎שׁ‎ ‎׳‎‎כִּת‎ Gen 31:2; Gen 31:5 (E), Exod 5:7; Exod 5:14 (J), 2Kgs 13:5, compare 1Sam 14:21; 1Sam 19:7 ‎׳‎‎גַּםשֿׁ‎ ‎׳‎‎גַּםתֿ‎ Exod 4:10 (J), 2Sam 3:17; 1Chr 11:2, compare 2Sam 5:2 ‎׳‎‎שׁ‎ ‎׳‎‎מִתּ‎ from aforetime, previously Exod 21:29; Exod 21:36 (E), Deut 4:42; Deut 19:4; Deut 19:6; Josh 4:18 (J), Josh 3:4; Josh 20:5 (both R), compare 1Sam 10:11 ‎׳‎‎שׁ‎ ‎׳‎‎כִּת‎ 1Sam 21:6* as formerly (but Bu ‎׳‎‎שׁ‎ ‎׳‎‎מִתּ‎ = for some days). — ‎׳‎‎שׁ‎ Prov 22:20 Kt is difficult; Qr ‎שָׁלִשִׁים‎ (see III. ‎שָׁלִישׁ‎) is impossible; supply perhaps ‎תְּמוֺל‎ have I not thee heretofore, etc.?

Brown-Driver-Briggs References

Book Refs
Genesis 31:2 · 31:5
Exodus 4:10 · 5:7 · 5:8 · 5:14 · 21:29 · 21:36
Deuteronomy 4:42 · 19:4 · 19:6
Joshua 3:4 · 4:18 · 20:5
Ruth 2:11
1 Samuel 4:7 · 10:11 · 14:21 · 19:7 · 21:6*
2 Samuel 3:17 · 5:2
2 Kings 13:5
1 Chronicles 11:2
Proverbs 22:20