The phrase "asserting something" is correct and usable in written English.
You can use it when you want to indicate that someone is stating or declaring a fact or opinion confidently.
Example: "In her presentation, she was asserting something that challenged the conventional wisdom of the industry."
Alternatives: "claiming something" or "stating something".
"I can't commit legal malpractice by not asserting something because I'm in a wheelchair," he said.
If you want to destroy public confidence, solemnly asserting something that is obviously untrue is a good way to start.
All of which is further evidence for the wisdom in that line from Hamlet about the lady protesting too much: strenuously asserting something is often a sign that, really, you doubt it, or believe the opposite.
The win was a tribute to a refreshing app that celebrates the best of what the subway has to offer, instead of asserting something that needs to be fixed.
That was not just a case of hyping intelligence, but of asserting something that had already been flatly discredited by an envoy investigating at the behest of the office of Vice President Dick Cheney.
But Reid is asserting something different: I conceive of a centaur itself not a mental representation of a centaur.
For after all, if truth is a norm of assertion, then, if you assert something false, you are open to criticism.
Atheists and theists are identical in one respect: they both assert something about which they know nothing.
David Donald asserts something like the opposite in his biography: "At about the time of Willie's death Lincoln's optimism about military affairs also began to vanish".
"It's one thing to have information in a classified document with caveats and footnotes, and another to have the president flatly assert something," an intelligence official said.
"The truth is, this commission really did not have access to the type of intelligence that would have been necessary to indisputably assert something new".
