Definition of "Tug" :
noun: a sudden abrupt pull
noun: a powerful small boat designed to pull or push larger ships
verb: struggle in opposition
"She tugged and wrestled with her conflicts."
verb: pull hard
"The prisoner tugged at the chains."
verb: pull or strain hard at
"Each oar was tugged by several men."
verb: move by pulling hard
"The horse finally tugged the cart out of the mud."
verb: carry with difficulty
verb: tow (a vessel) with a tug
"The tugboat tugged the freighter into the harbor."
verb: strive and make an effort to reach a goal
"She tugged for years to make a decent living."