This is the 7363rd most frequent Japanese word.
仕切っ
"仕切っ" is the stem form of "仕切る," meaning "to manage," "to divide," or "to take control."
In this sentence, '仕切った' refers to taking charge or controlling the proceedings of the meeting.
彼は会議を仕切った。
He presided over the meeting.
Here, '仕切っています' indicates dividing or separating the room with a physical barrier, such as curtains.
部屋をカーテンで仕切っています。
They are dividing the room using curtains.
In this example, '仕切ろう' is used in an attempt to describe someone who tries to take charge or oversee every aspect of a situation excessively.