This is the 2223rd most frequent Japanese word.
終わら
"終わら" is the incomplete conjugation of the Japanese verb "終わる" (owaru), meaning "to end" or "to finish."
The stem '終わら' here is followed by the negative verb ending 'ない', forming '終わらない', meaning 'hasn't finished', describing an ongoing action that has not yet concluded.
授業がまだ終わらない。
The class hasn't finished yet.
The word '終わら' is combined with the causative form 'せる', creating '終わらせる', meaning 'to cause to finish', used here to inquire about completing an action.
このプロジェクトはどうやって終わらせるのだろう？
I wonder how we will finish this project.
The term '終わら' is used with the causative 'せ', forming '終わらせて', which is a request phrased as a polite command to finish the action described.