To pull or draw with great effort; to draw along with continued exertion; to haul along; to tow; as, to tug a loaded cart; to tug a ship into port.

To pull; to pluck.

To pull with great effort; to strain in labor; as, to tug at the oar; to tug against the stream.

A pull with the utmost effort, as in the athletic contest called tug of war; a supreme effort.

To labor; to strive; to struggle.

strive and make an effort to reach a goal; "She tugged for years to make a decent living"; "We have to push a little to make the deadline!"; "She is driving away at her doctoral thesis"

struggle in opposition; "She tugged and wrestled with her conflicts"

"Timeshare Users Group"

Tributary Unit Group. A multiplexing scheme of assembling individual Tributary Units into a higher unit of bandwidth, it is made up of a group of identical TUs.

tributary unit group; a managed group of TU