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.5.21Chr.11.2
שִׁלְשׁ֖וֹם three days ago Josh.4.18
שִׁלְשׁ֔וֹם three days ago 1Sam.10.111Sam.14.21
שִׁלְשׁ֑וֹם third day Deut.4.42
שִׁלְשֽׁוֹם third day Deut.19.6Josh.20.5
three days ago Gen.31.2Josh.3.4Ruth.2.111Sam.19.72Kgs.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.5.14Exod.21.361Sam.21.5
שִׁלְשֹׁ֑ם three days ago Gen.31.5Exod.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 (ii. 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