The phrase "piercing deep" is correct and usable in written English
You can use it to describe something that penetrates or cuts deeply into something else, such as sound, gaze, or pain. For example, "He looked at her with a piercing deep gaze that she could not escape."
Although I was aware of her ploy, I couldn't keep the thorns of her words from piercing deep.
It's unleashing the wrath of insults when insecurity takes hold, throwing daggers at him, he takes each one, flinching, bracing and allowing it to bounce off, never piercing deep enough to cause permanent damage.
She described to me the feeling of a syringe piercing deep into her butt and excreting as much as 600cc of industrial silicone simply as "filling," as if her butt were a water balloon stretched over the nozzle of a garden hose.
Solid FMJ bullets do not have the problem of losing their energy as quick and are known for penetrating through barriers and still piercing deep enough into flesh to arrive at vital organs.
Even now, in her early 70s, Steele still has that uncanny, saturnine look and those piercing, deep-set eyes that made her such an unsettling screen presence.
Together we are working to realize this film story, which pierces deep into the shadows of the First World War.
At the same time, the 61st Infantry Division and the Strachwitz tank squadron pierced deep into the 59th Army's defences, splitting the two rifle corps apart and forcing them to retreat to their fortifications.
When Mourre and his colleagues compared the artifacts with the copies, almost three-fifths of the ancient tools showed marks of pressure flaking: They had thinner, straighter edges that could pierce deeper and last longer.
I found it fascinating, with piercing fruit, deep underlying tannins and aromas of wildflowers and berries.
"Whereas Cockney, 'at kind of a fing, is middle back, and American" — think Shelley Winters at her most piercing — "is deep in the jowls".
"Whereas Cockney, 'at kind of a fing, is middle back, and American"—think Shelley Winters at her most piercing—"is deep in the jowls".
