The phrase "are sinking to" is correct and usable in written English.
It can be used to describe a decline or deterioration in a situation, condition, or state, often implying a negative outcome.
Example: "The company's profits are sinking to an all-time low due to poor management decisions."
Alternatives: "are falling to" or "are declining to".
"It started with throwing stones, but now the extremists are sinking to the level of the police by throwing fireworks and firebombs," said Ece Yavuz, 36.
It is well known that when rock particles are sinking to the ocean floor to form layers of new sediment, tiny magnetic grains within the particles align themselves with the magnetic lines of the Earth.
Council leader Mr Smith said: "I think what it [the new strikes] demonstrate is the depths the unions are sinking to in order to disrupt services for people in the city.
Polls suggest that millions are prepared to take to the streets, while trust in the police, the courts, the Kremlin and in Putin himself are sinking to all-time lows.
The media of late have been touting the story of "Obama's dropping approval ratings" noting that his "approval ratings have plunged to record lows" and have "plummeted" and are "sinking to historic lows". Only one problem with this narrative: it is factually and demonstrably false.
One of these piers was sunk to bedrock, 108 feet below the river surface, the other 17 piers are sunk to the hardpan, which is 80-90 feet below the water level.
Bay, meanwhile, is sinking to a new depth.
She was sinking to the ground like a stricken horse.
But his political fortunes were sinking to their lowest ebb - at Arab hands.
As Ukip continues to rise up the polls, the political establishment is sinking to even greater depths to smear us.
After rallying for a few hopeful months this spring, the stock market is sinking to its lowest level in years.
