expression
until the very last minute; up to the breaking point
Used when something is delayed or stretched to its absolute limit, often with a sense of urgency or risk.
締め切りぎりぎりまでレポートを書いていた。
I was writing the report until the very last minute before the deadline.
彼はいつもぎりぎりまで準備をしない。
He never prepares until the last possible moment.