Fetching details from the dictionary...

to divide; to separate; to partition; to demarcate; to delimit; to mark off
to punctuate; to mark off (with a comma); to insert pauses (between words or phrases when reading aloud); to space one's words
文章を段落で区切って読みやすくした。
I divided the text into paragraphs for readability.
長くなったので話を一度区切って休憩しよう。
Let's take a break and pause the discussion.
ここで一区切りにしよう。
Let's wrap up here.