終わらせよう

let's finish, let's get done with

→ 終わらせる
終わら end, finish + せ Causative + よう Volitional
verb · informal Rare #43,024
let's finish, let's get done with Volitional form, used to suggest finishing something together or to express an intention to finish it.
JA: 宿題を終わらせよう。
EN: Let's finish the homework.
Conjugation of 終わらせる
Optative
終わらせよう

さっさと終わらせようよ。

Let's get this over with.

今日こそ終わらせよう

Let’s finish it today, for sure.

— すずめの戸締まり (2022)

さっさと終わらせよう

Let's get this over with.

— ウィキッド ふたりの魔女 (2024)