Machete
From Tardis Wiki, the free Doctor Who reference
A machete was a large knife used for fighting as well as for cutting food and plants.
Sontaran Field Major Styre used a machete to fight the Fourth Doctor. (TV: The Sontaran Experiment)
The Tenth Doctor and Rose Tyler used machetes to cut through foliage searching for the Dramos to cure Galathos of the sickwind. (COMIC: Blood and Tears)
Chris Cwej used one to cut open coconuts when he and the Seventh Doctor were stranded on an island. (PROSE: No Room)