Hi, what does this expression means?
"The crowd was maybe a thousand strong, overwhelmingly
white. As Obama unfurled his speech, a narrative about the
transition from the twentieth century into the twenty-first"
Hi Shenfeng thanks ... What the strong means there?
The strength of a group of people relates to how many people are in it. So you could say, for instance, "We were a houndred men strong." This would mean that you were in a group of 100 people. It's an emphasizing use of the adjective "strong" here.