The phrase "a sharp bit of" is correct and usable in written English.
It can be used to describe a small, pointed, or incisive piece of something, often in a metaphorical sense, such as a sharp bit of advice or insight.
Example: "She offered a sharp bit of criticism that made me rethink my approach to the project."
Alternatives: "a keen piece of" or "a pointed remark about".
Roger thought, as he stepped on a sharp bit of Optimus Prime.
Even in the war Churchill experienced a sharp bit of that.
Mr. Rayfiel excelled at bringing an amorphous role into focus with a sharp bit of dialogue or a restructured scene that illuminated a character's inner life.
This was a sharp bit of literary criticism; the magic of fairy tales is the pagan magic of fortune, rather than of virtue, and of fate, rather than of faith, or even grace.
As the movie's title suggests, and as a sharp bit of dialogue (reminiscent of Bob Dylan's 1979 word of caution that "you're gonna have to serve somebody") states outright, Anderson is after something bigger than a tale about Scientology: he's after mastery as such.
There will be a sharp bit of pain that goes almost immediately as and when it is applied".
He insisted we moved piles of building rubble from the back of the house and we picked up stray nails and any sharp bits of metal that they might lurch into.
Sure, we carefully covered every inch of trim in a heavy moving blanket beforehand, lest some sharp bit of bike drivetrain nip at the Targa's interior, but the point is, we did it, and even drove home with our Italian cargo and our loaner German hauler both arriving unscathed.
It's full of good jokes, tiny sharp bits of description, nuggets of gossip.
Similarly, Kennedy's brilliant descriptions of the action in the ring are studded with sharp bits of autobiographical suspense, allowing us to take pleasure, like the audience at the corrida, in the artful communication of suffering.
NEWS The explosives that killed three people and injured more than 170 during the Boston Marathon on Monday were most likely rudimentary devices made from ordinary kitchen pressure cookers, except they were rigged to shoot sharp bits of shrapnel into anyone within reach of their blast and maim them severely, law enforcement officials said Tuesday.
