This is a modified version of the verb to drive. Firstly, the torso has been transformed into the body of a vessel with a handle. Then, some flowing lines, which suggest movement, have been
added. Hence, this is an ideograph for the verb to pour.
Sample Text Reference:
Mohenjo-daro: Seal: M-66 a: Jagat Pati Joshi and Asko Parpola, 1987: Corpus of Indus Seals and Inscriptions: Volume 1: Page 29: Collections in India: Suomalainen Tiedeakatemia.
This is Mahadevan's sign number 1052, which I have redrawn to better reflect the original.
There is only one extant example of this Indus sign.