The phrase "a telling expression" is correct and usable in written English.
It can be used to describe an expression that reveals significant information or insight about a person's feelings or thoughts.
Example: "Her face held a telling expression that suggested she was not pleased with the decision."
Alternatives: "an revealing expression" or "a significant expression".
It was a telling expression of Silicon Alley's uneasiness about the giant Microsoft.
For a more complex case, where a traditional mesh is augmented with some additional diagonal links, after providing a telling expression for the average distance between its two processors, we prove that this latter expression cannot be represented in a closed-form format, with respect to a fairly general class of "standard operations", namely, the class of the hypergeometric terms.
A particularly telling expression of the new attitude can be found in a 2009 pamphlet called Spread This Wealth.
His father listened silently with no telling expression on his face.
The man looked at the baby and turned to her mother "with a strange expression," telling her, "This child shall be great".
After years of posing for photos like a brooding 60s version of Heathcliff, here he is, a little disheveled, with wonky teeth and a rueful expression, telling stories to illustrate "how childish I am".
In Hansmeyer's telling, individual expression might be making a comeback, except on a scale that is mass-produced.
Even at its edgiest, artificial intelligence cannot hold up its side of a wide-ranging conversation or, say, tell by an expression when someone is about to cry.
When I was growing up, my older Mexican-American relatives had an expression: "Tell me who your friends are, and I'll tell you who you are".
When I tell people I served in the United States Army in the 1950s, total strangers assume a worshipful expression and tell me "thank you for your service".
Having briefly discussed one important contextualist thesis, let's return to the general question which faces the semantic theorist, which is: How do we tell when an expression is context-sensitive?
