The phrase "emphasize subject" is grammatically correct and can be used in written English.
It is typically used when discussing the act of placing emphasis on the subject of a sentence. Here is an example: In order to effectively communicate her argument, the author used bold font and italics to emphasize the subject of her research paper.
Wikipedia's editors tend to be from the technology crowd and therefore emphasize subjects that they know, like math and science, at the expense of the humanities, Mr. Wales said.
This approach emphasizes the importance of creating an environment conducive to completing study tasks which differs in focus from other perspectives that might emphasize subject-related factors such as fear, anxiety or boredom as contributors to task noncompliance.
They have also shriveled the curriculum, emphasizing subjects that will help improve test scores, while shunning science and social studies -- subjects not covered by the tests.
Porter focused on selling his paper in the south and west of the United States, and emphasized subjects of use to his readers, such as cattle breeding, farm methods, books of interest, as well as sports.
(Traditionally controlled through a DSLR lens's aperture, bokeh is the out of focus part of the background that helps to emphasize the subject, drawing the viewer's eyes to the most important part of the photo).
Some can also emphasize the subject's role in the sentence, for example: "I myself will take on the challenge".
While Texas charter schools must meet core curriculum standards, they may emphasize some subjects over others, as Harmony does with math, science and technology.
Though most juku emphasize academic subjects important in studies and examinations, some juku offer instruction also in nonacademic arts and sports.
The exactness with which he paints is akin to the work of Charles Sheeler, whose precise paintings emphasized a subject's function so intently that his works were at times some like an abstract painting than a representational one.
