TgO Gen26:18 :בֵירֵי דְמַיָא דַחפַרֻו בְיוֹמֵי אַברָהָם אֲבֻוהִי וְטָמֻונִין פְלִשתָאֵי בָתַר דְמִית אברהם‏ : the wells they had dug in the days of his father Abraham: but the Philistines had dammed them up after Abraham had died
See the entire entry for ṭmm vb. to stop up by filling