threatening, aggressive, but not willing to engage in a fight
full of talk, but low on action
talk that is more impressive than one can actually do
顺便摘录几个例句：
I heard he has threatened you with dire consequences if you don not stop that construction. Don’t worry, he is all bark and no bite.
He looks rough and dangerous, somewhat like a gangster and talks tough, but he is all bark and no bite.
