The phrase "to underscore this commitment" is correct and can be used in written English.
It typically means to emphasize or highlight a particular commitment or belief. Example: "Our company is dedicated to providing the highest quality products and services to our customers, and we have implemented strict quality control measures to underscore this commitment."
To underscore that commitment Mr. Burke contacted Mr. Leno late last month to try to quell a dispute between Mr. Leno and Robert Greenblatt, the top NBC entertainment executive in Los Angeles.
To underscore the commitment, Forbes also increased the magazine's trim size an expensive investment, I can assure you–at a time when most other publishing companies were going in the opposite direction (and continue to do so).
And to underscore our commitment to this goal, Iraq recently became the 161st nation to ratify the Comprehensive Nuclear Test Ban Treaty.
The party this year was determined to underscore its commitment to a state that is not reliably Republican.
"The increase in reports that we're hearing only serves to underscore their commitment to get to the bottom of this in an urgent and comprehensive fashion," said William C. Bodie, the chief Air Force spokesman.
But when the company was looking for ways to underscore its commitment to enhancing the healthiness of its products, it decided it needed to do something more dramatic.
Susan E. Rice, the American ambassador to the United Nations, defended the administration's record, saying that President Obama was attending the summit meeting to underscore his commitment to the goals.
Asked about the report, Mr. Campbell said the United States believed that Chinese officials had "taken steps to underscore their commitment to the transition in power in North Korea".
With Omega and TAG Heuer's proxies dueling for supremacy on the high seas, IWC Schauffhausen has taken a different tack to underscore its commitment to the ocean.
To underscore his commitment, he began a statewide bus tour that will run through Friday and include an appearance by Phyllis Schlafly, the conservative activist.
Mr. Obama's new packaging for the government's existing public-private efforts also allowed him to underscore his commitment to manufacturing jobs as the economy continues to sputter, and in a swing state for presidential elections.
