What it means
てみせる expresses the speaker’s strong determination or confident resolve to carry out an action, often with the nuance of proving that it will be done despite difficulty or doubt. It follows a verb in the て-form and is more forceful than てみる, which simply means to try doing something. The form can describe a promise, a challenge, or a firm declaration about a future action.
Usage note
てみせる can sound dramatic, emphatic, or confrontational, so it is less suitable for neutral statements of intention. In polite speech, the auxiliary becomes みせます, but the determined nuance remains.
How to use it
私は今年中に論文を完成させてみせます。
I will definitely complete the paper by the end of this year.
私は今年中に論文を完成させてみせる。
I will definitely complete the paper by the end of this year.
Example sentences
誰も解けなかったこの難問を、今夜中に解いてみせる。
I’ll definitely solve this difficult problem that no one could solve by tonight.
周囲に反対されても、私はこの計画を必ず成功させてみせます。
Even if those around me oppose it, I will definitely make this plan succeed.
来月の発表会では、練習の成果