A cutlass is a short sword that used to be used by sailors. a short sword with a curved blade, used by sailors or pirates in the past (coutelas, from coutel , from cultellus)
A bearing on the drive shaft of a vessel; It is usually made of brass with an inner grooved rubber lining that is lubricated by the surrounding water entering the grooves as it rotates
When you replace a drive shaft on your boat it is also a good idea to replace the cutlass bearing where the drive shaft exits the boat.