Lexical Definition

‎עָצַם‎ ʻâtsam (aw-tsam') be vast H:V
a primitive root; also denominatively (from ‎עֶצֶם‎)

break the bones, close, be great, be increased, be (wax) mighty(-ier), be more, shut, be(-come, make) strong(-er).

1) to be vast, be numerous, be mighty
1a)(Qal)
1a1) to be mighty
1a2) to be numerous
1b) (Hiphil) to make strong, make mighty
2) to shut (the eyes), close (the eyes)
2a) (Qal) to shut (the eyes)
2b) (Piel) to shut tightly (the eyes)

See Greek: δυνατός · ἰσχύω · καμμύω · κατισχύω · κραταιός · κραταιόω · πληθύνω · στερεόω

Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
וַיְעַצֵּ֖ם and he has shut Isa.29.10
וְעֹצֵ֥ם and shuts Isa.33.15

Brown-Driver-Briggs

I. [‎עָצֹם‎, compare LagBN 31], ‎עָצַם‎ verb be vast, mighty, numerous (Late Hebrew Nithp. contend strenuously, and in derivatives; Phoenician in ‎עצמת‎ mighty deeds, ‎עצמם‎ bones; Arabic be great in bone, or anything, , bones; Ethiopic : id.; Aramaic ‎עִטְמָא‎, thigh): —

Qal Perfect 3 masculine singular ‎וְעָצַם‎ consecutive Dan 8:24; Dan 11:23 2 masculine singular ‎עָצַמְתָּ‎ Gen 26:16 3 plural ‎עָֽצְמוּ‎ Isa 31:1 +, ‎עָצֵ֑מוּ‎ Ps 38:20* Imperfect 3 masculine plural ‎וַיַּעַצְמוּ‎ Exod 1:7; Exod 1:20 Infinitive construct ‎עָצְמַת‎ Isa 47:9 suffix ‎עָצְמוֺ‎ Dan 8:8

1. be mighty, Gen 26:16 (J; with ‎מִן‎ compare), Dan 8:8; Dan 8:24; Dan 11:23.

2. be numerous, || ‎דַבּוּ‎ etc., Isa 31:1, ‎בְּעָצְמַת חֲבָרַיִח מְאֹד‎ Isa 47:9, Jer 5:6; Jer 30:14; Jer 30:15; Exod 1:7 (P), vExod 1:20 (J), Ps 38:20*; Ps 69:5* with ‎מִן‎ compare Jer 15:8; Ps 40:6*; Ps 40:13* alone Ps 139:17. Hiph`il make strong, Imperfect 3 masculine singular: suffix ‎וַיַּעֲצִימֵחוּ‎ Ps 105:24 + ‎מִן‎ compare

Also see: עָצָה

II. [‎עָצַם‎] verb shut the eyes (Late Hebrew Hiph`il; possibly connection with Syriac = id., Arabic , IV (on = see ZMG xxxii (1878), 406); Late Hebrew ‎עִמֵּץ‎ close eyes of dead; compare BaES 5f.); —

Qal Participle ‎וְעֹצֵם עֵינָיו מִן‎ Isa 33:15 shutteth his eyes from seeing Pi`el Imperfect 3 masculine singular ‎וַיְעַצֵּם אֶתעֵֿינֵיכֶם‎ Isa 29:10 he hath tightly shut your eyes (compare I. ‎עצה‎).

Brown-Driver-Briggs References

Book Refs
Genesis 26:16
Exodus 1:7 · 1:20
Psalms 38:20* · 40:6* · 40:13* · 69:5* · 105:24 · 139:17
Isaiah 29:10 · 31:1 · 33:15 · 47:9
Jeremiah 5:6 · 15:8 · 30:14 · 30:15
Daniel 8:8 · 8:24 · 11:23