The phrase "a sizeable and growing" is correct and usable in written English.
It can be used to describe something that is both significant in size and increasing over time, often in contexts related to populations, markets, or trends.
Example: "The city has a sizeable and growing population of young professionals who are moving in for job opportunities."
Alternatives: "a substantial and expanding" or "a considerable and increasing".
"Over the past several years Louise and her team have done an outstanding job in transitioning the business to become the leading site for teachers both online and in print while gaining a sizeable and growing audience across the globe," said Karl Peterson, managing partner for TPG Capital LLP, in a statement.
He adds that there is a "sizeable and growing market" for any accurate data about web users, even when it is bought and repackaged from another site.
On one issue, though, there is a sizeable (and growing) bloc of voters who are not only cross-partisan but also so committed they could be called "single-issue voters".
"While Theresa May vows to be a 'one nation' Prime Minister, she evidently has issues with a sizeable and growing group within that nation: a group that she would rather impose harsh policy against rather than engage in dialogue with".
This indicates that a sizeable and growing number of older individuals might be at risk for IL-6-mediated cognitive effects.
There is a sizeable and growing burden of drug-resistant TB in China, and this has implications for the management of DM patients.
Critics of the policies – a noisy, sizeable, and growing minority – argue offshore processing ignores the human cost of a detention regime designed to be brutal in order to deter others.
There is an immense philosophical literature dealing with the notions of normativity and agency, as well as a sizeable and rapidly growing scientific literature on the topic of autonomous agents.
First, since the older population is a sizeable and ever growing demographic group with limited time to recover from economic shocks like the one recently experienced, we seek to understand how the recession impacted this demographic group overall.
It is sizeable and growing fast: in the first half of 2006, carbon to the value of €12 billion ($15 billion) was traded, five times more than in the same period in 2005.
