Lexical Definition

‎עָמַר‎ ʻâmar (aw-mar') to bind H:V
a primitive root; properly, apparently to heap; figuratively, to chastise (as if piling blows); specifically (as denominative from ‎עֹמֶר‎)

bind sheaves, make merchandise of.

1) to bind sheaves
1a) (Piel) to gather
2) to manipulate, deal tyrannically with
2a) (Hithpael) to treat as a slave

See Greek: συλλέγω

Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
תִתְעַמֵּ֣ר you will treat as a slave Deut.21.14
וְהִתְעַמֶּר and he will treat as a slave Deut.24.7

Brown-Driver-Briggs

[‎עִמֵּר‎] verb Pi`el denominative bind sheaves (Late Hebrew id., so ᵑ7 Ps 129:7, compare Christian-Palestinian Aramaic SchwIdioticon 69); — Participle ‎מְעַמֵּר‎ Ps 129:7 (in simile; || ‎קוֺצֵר‎).

II. [‎עָמַר‎] verb Hithpa`el deal tyrannically with (‎ב‎) (Arabic cherish enmity, rancour, malice, III. plunge into a conflict, rancour, malice); — Perfect 3 masculine singular ‎וְהִתְעַמֶּרֿ‎ consecutive Deut 24:7 Imperfect 2 masculine singular ‎תִּתְעַמֵּר‎ Deut 21:14.

Brown-Driver-Briggs References

Book Refs
Deuteronomy 21:14 · 24:7
Psalms 129:7