From an unused root meaning to tie up; a stall (for cattle) -- X fat(-ted), stall.
Englishman's Concordance
1) stall (of animals) Part of Speech: noun masculine A Related Word by BDB/Strong’s Number: from an unused root meaning to tie up Same Word by TWOT Number: 2110a
Brown-Driver-Briggs
מַרְבֵקnoun [masculine]stall (literally tying-place); — ׳עֲגָלִים מִתּוֺךְ מAmos 6:4calves out of the stall (where they were fattened); ׳עֵגֶלמֿ1 Samuel 28:24 i.e. a stall-fed, fatted, calf; so ׳כְּעֶנְלֵי מMalachi 3:20 (simile of prosperity), Jeremiah 46:21 (simile of well-fed and arrogant mercenaries).
1 Samuel 28:24 HEB:וְלָאִשָּׁ֤ה עֵֽגֶל־ מַרְבֵּק֙ בַּבַּ֔יִת וַתְּמַהֵ֖ר NAS: The woman had a fattened calf KJV: And the woman had a fat calf INT: the woman calf fattened the house quickly
Jeremiah 46:21 HEB:בְקִרְבָּהּ֙ כְּעֶגְלֵ֣י מַרְבֵּ֔ק כִּֽי־ גַם־ NAS: in her midst Are like fattened calves, KJV: [are] in the midst of her like fatted bullocks; INT: her midst calves fattened For even
Amos 6:4 HEB:וַעֲגָלִ֖ים מִתּ֥וֹךְ מַרְבֵּֽק׃ NAS: from the midst of the stall, KJV: out of the midst of the stall; INT: and calves the midst of the stall
Malachi 4:2 HEB:וּפִשְׁתֶּ֖ם כְּעֶגְלֵ֥י מַרְבֵּֽק׃ NAS: like calves from the stall. KJV: and grow up as calves of the stall. INT: and skip calves the stall