Begone
/bɪˈɡɔːn/
Definition 1 of 1
Pro Tip 1/3Archaic Usage
Begone is old-fashioned; modern English speakers rarely use it in casual conversation. 
You might find 'begone' in old literature, but not in modern dialogues.
Pro Tip 2/3Commanding Tone
Begone carries a commanding, sometimes unfriendly tone when telling someone to leave. 
'Begone before I lose my patience,' said the irritated shopkeeper.
Pro Tip 3/3Abrupt Dismissal
Using 'begone' can seem rude or abrupt; it's not polite or gentle in telling someone to go away. 
Her stern voice commanded, 'Begone at once!'