村上春樹の短編集の中の 'Thailand' から引用します。
She opened her book and tried to read from where she had left off, but forgetting was out of the question.
本一冊をを一気に読んでしまうことはまずないので、ほとんどの場合前に読んでいた終わりから読み始めるのですが、前に読み終えて止めた箇所を表現するのに英語でこの様に簡単に言えるのですね。 "leave off" の意味と用法を辞書で確認します。
・Oxford English Dictionary: Discontinue (an activity): He must start every day where he had to leave off the previous evening.
・Dictionary.com: Stop, cease; also, stop doing or using. For example, Mother told the children to leave off running around the house, or Please use a bookmark to show where you left off reading.