The phrase "a certain finger" is correct and usable in written English.
It can be used when referring to a specific finger without naming it directly, often in a context where the identity of the finger is implied or understood.
Example: "He pointed to a certain finger on his hand, indicating which one he had injured."
Alternatives: "a specific finger" or "one particular finger".
"He played with a certain finger style that was highly unusual," said Toussaint.
The chain keeps back most of the crowd, but there remain a number of well-groomed, middle-aged chain-crashers who regularly lift it and dash across, sometimes stopping to show Mr. Apel a certain finger or leave a few choice words ringing in his ears.
Instead, if we look back to the pre-digital era of walking down the street with a prearranged shopping bag or wearing a particular color scarf or a ring on a certain finger or having a certain item for lunch, we see that all of these myriad and creative signals were designed to be executed in the full view of adversarial counterintelligence officers.
From what I understand, he was sticking a certain finger up in the air".
Trump said his supporter was provoked by a protester who waved "a certain finger" in the air.
Jennifer Lopez quickly quashed a rumor that she is engaged to boyfriend Casper Smart, which surfaced after she was spotted wearing some diamonds on a certain finger.
A showering of new season truffle just-snuffled-from-the-ground-by-a-specially-reared-hound can add a certain finger-snapping joie de vivre to many dishes.
At the height of the fame of a certain finger-sucking television cook, I realised in horror that someone had befriended me purely as a means to getting my sister's telephone number.
Each virtual finger combination is associated with a preshape hand configuration with certain finger angles that can be modulated by the maximum aperture parameter, and a set of fingers to control during the enclose phase.
When assessed within groups, we identified significant directional asymmetries (DA) for certain finger ridge counts but not for a-b ridge counts.
The 25-year-old singer was spotted with a silver band on a certain, significant finger in a picture posted on London musician Jovel Walker's Instagram a few days ago. .
