Serious question - how can someone be charged with "attempted manslaughter"?

My understanding of manslaughter is that it is murder that wasn't intended as a murder. Perhaps the person intended to injure someone but didn't intend for them to die, so they'd end up being charged with manslaughter...

But "attempted" means they tried to do something.. If you try to murder someone without meaning to murder them... that doesn't make sense to me..

what am I getting wrong here?