Example: The horse finally tugged the cart out of the mud.
source: wordnet30
pull or strain hard at(verb.contact)
Example: Each oar was tugged by several men.
source: wordnet30
struggle in opposition(verb.competition)
Example: She tugged and wrestled with her conflicts.
source: wordnet30
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.(verb)
source: webster1913
To pull with great effort; to strain in labor; as, to tug at the oar; to tug against the stream.(verb)