TgJ 2Sam14:14 :הָא כְמַיָא דְמִתאַשדִין לְאַרעָא דְלָא אִפשָר לְהוֹן דְיִסתְפוֹן‏ : like water poured out on the ground, which is impossible to be swept up
See the entire entry for spy vb. to heap up