From 'acar; bound, i.e. A captive -- (those which are) bound, prisoner.
see HEBREW 'acar
H615. asir
אָסִיר noun masculineGenesis 39:20 bondman, prisoner (Arabic , Aramaic , MI אסר) — ׳א absolute Psalm 79:11; 102:21; plural אֲסִירִם Genesis 39:22 +, compare Judges 16:21, 25 Kt; construct אֲסִירֵי Psalm 107:10 +, Genesis 39:20 Qr; אֲסִירָיו Psalm 69:34 +, etc.; — Prisoner Genesis 39:20, 22 (J), elsewhere only poetic; Isaiah 14:17; as having rest in grave from task-master Job 3:18; especially as object of divine compassion Psalm 68:7 ("" יָתִיר), 69:34 ("" אֶבְיוֺן); א ׳אֶנְקַת 79:11; 102:21 (both "" תְמוּתָה בְּנֵי), 107:10 ׳א וּבַרְזֶל עֳנִי ("" וְצַלְמָ֑וֶת חשֶׁח ישְׁבֵי); compare ׳א אָ֑רֶץ Lamentations 3:34; specifically of liberated exiles of Israel Zechariah 9:11, called captives of hope ׳א הַתִּקְוָה 9:12.