To Prolong Something
To Lengthen Something, To Extend Something
transitive verb, godan verb
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means prolong and this verb means to prolong something.
延ばす conveys the idea of expanding upon something that already exists to make it longer, often in terms of time or physical distance. For example, it can refer to delaying a schedule or extending a railway.
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you:
Do you mind if I go to prolong things? The answer? "No (の), I don't mind."
帰国の予定を一週間延ばすことにしました。
I have decided to postpone my return to the country by one week.
今のところ、路線を延ばす計画はありません。
Currently, there are no plans to extend this railway route.
返済期間を延ばすことはできますか？
Is it possible to extend the repayment term?