To hold one section of an object such as pipe while another section is being screwed into or out of it.

1) to unscrew one section of pipe from another section, especially drill pipe while it is being withdrawn from the wellbore. During this operation, the tongs […]

Usually means unscrewing the drill stem into single joints and placing them on the pipe rack. This operation takes place at the completion of the well […]

To complete a well and put it on producing status.