The phrase "a touch smaller" is correct and usable in written English.
It can be used to describe something that is slightly smaller in size or amount compared to something else.
Example: "The new model of the phone is a touch smaller than the previous version, making it easier to hold."
Alternatives: "a bit smaller" or "slightly smaller".
Like New Orleans itself, Mike's is back — just a touch smaller and with a twist.
Though they measured the place thoroughly, it seems a touch smaller than they would like, so they are downsizing some of their furniture, including the coffee table.
The rise in the headline business climate indicator was a touch smaller than the consensus forecast, but it left the index at its highest level since April 2012.
Sandy Chen, analyst at Cenkos, said: "The total of $670m including the earlier $340m NY DFS settlement is a touch smaller than the $730m that we had pencilled in.
This one uses the power of USB-C, which results in an adapter that's a touch smaller than the alternatives.
It's half as small as the current portable size and even a touch smaller than micro USB.
The makers of "Wonder Boys, Douglass's finest hour, did more to maintain their distance, and their patience, and "Solitary Man" feels a touch small and sour by comparison.
And although Elīna Garanca made for a visually captivating Carmen, seducing the males not only with her figure but with her darting eyes, the grain of her voice — creamy, precise, a touch small, finely projected — was wrong for the part, which needs an edgier, smokier timbre.
They arrived to a reception that was unstintingly generous, if not without a touch of small-town chauvinism.
The best salvage, though, Jeydah keeps for herself: a sphere that gives off light; a pane of glass you can heat with a touch; a small black block that speaks stories of the way the world once was.
But beyond the glitz, Miami is a safe, impressively clean city with a touch of small-town charm in neighborhoods like South Beach, Coconut Grove, and Coral Gables.
