Strong's Concordance

Original word: מִרְפַּשׂ
Transliteration: marpes
Definition (short): foul
Definition (full): (water) befouled

NAS Exhaustive Concordance

Word Origin: from raphas
Definition: (water) befouled
NASB Translation: what you foul (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

From raphas; muddled water -- that which...have fouled.

see HEBREW raphas

KJV: And as for my flock, they eat that which ye have trodden with your feet; and they drink that which ye have fouled with your feet.
NASB: 'As for My flock, they must eat what you tread down with your feet and drink what you foul with your feet!'"