-tussle-

meaning:

1. (disagree) to have difficult disagreements or fierce arguments
The residents are still tussling over the launching of that concert.

2. (fight) to fight with another person using your arms and body
Both of the teams started to tussle at the middle of the field.

3. (tussle with something) to try hard to understand or deal with a difficult idea or problem
That is a problem that we have been tussling with for many years.