From 'acaph; properly, containing, i.e. A tube; also a bed or valley of a stream; also a strong thing or a hero -- brook, channel, mighty, river, + scale, stream, strong piece.
see HEBREW 'acaph
H650. aphiq
[אָפִיק] noun masculine2 Samuel 22:16 channel (as holding, confining waters; in poetry) — constructאֲפִיק Job 6:15; pluralאֲפִיקִים Ezekiel 6:3 +; אֲפִקִים 32:6; construct אֲפִיקֵי Joel 1:20 +; suffix אֲפִיקֶיךָ Ezekiel 35:8; אֲפִיקָיו Isaiah 8:7 — channel = stream-bed, ravine, wady ׳א מַיִם Psalm 42:2; Joel 1:20; compare Joel 4:18; Song of Solomon 5:12; also Psalm 18:16, but better ׳א יָם 2 Samuel 22:16; ׳א נְחָלִים Job 6:15; of river-bed Isaiah 8:7; so also (without defining word) Ezekiel 31:12; 32:6; 34:13; Psalm 126:4; "" גַּיְא Ezekiel 6:3; 35:8; 36:4, 6; figurative of bones of hippopotamus (as hollow) ׳א נְחֻשָׁה Job 40:18; of furrows between scales of crocodile ׳א מָגִּנִּים 41:7 — אֲפִיקִים מְזִיהַ 12:21 is dubious; read perhaps אַבִּירִים Du (see also Bu). Thes MV Di and others say girdle of the strong (אָפִיק = firm forceful, or — Di — capable, powerful); "" נְדָבִים.