アニメ：<span class='vocab-popout' data-vocab-id='416'>友達（ともだち）</span>１「<span class='vocab-popout' data-vocab-id='359'>先輩（せんぱい）</span>に<span class='vocab-popout' data-vocab-id='849'>私（わたし）</span>の<span class='vocab-popout' data-vocab-id='738'>気持（きも）ち</span>を絶対（ぜったい）気付（きづ）かせ<strong>てみせる</strong>わ！」<br>頼（たよ）れる<span class='vocab-popout' data-vocab-id='416'>友達（ともだち）</span>２「がんばれ！」

負（ま）けた後（のち）、相手（あいて）を挑戦（ちょうせん）<span class='vocab-popout' data-vocab-id='138'>する</span>：「<span class='vocab-popout' data-vocab-id='712'>次（つぎ）</span>こそ、必（かなら）ず勝（か）っ<strong>てみせる</strong>ぞ！<span class='vocab-popout' data-vocab-id='972'>あなた</span>には負（ま）けない！」<br>相手（あいて）「よし、かかってこい！」

小説（しょうせつ）：「必（かなら）ず<span class='gp-popout vocab-popout' data-gp-id='30' data-vocab-id='91'>この</span><span class='vocab-popout' data-vocab-id='598'>手（て）</span>で魔王（まおう）を倒（たお）し<strong>てみせる</strong>という勇者（ゆうしゃ）えみり<span class='gp-popout vocab-popout' data-gp-id='47' data-vocab-id='9'>あの</span><span class='vocab-popout' data-vocab-id='953'>言葉（ことば）</span>に、わたしたちは賭（か）けることにした。」

「<span class='vocab-popout' data-vocab-id='185'>どんな</span><span class='vocab-popout' data-vocab-id='598'>手（て）</span>を使（つか）って<span class='vocab-popout' data-vocab-id='166'>でも</span>、絶対（ぜったい）、成功（せいこう）し<strong>てみせる</strong>！」

「<span class='vocab-popout' data-vocab-id='334'>何（なに）</span>があっても、必（かなら）ずファンの期待（きたい）に応（こた）え<strong>てみせます</strong>！」

「<span class='vocab-popout' data-vocab-id='307'>今年（ことし）</span>こそ、必（かなら）ず<span class='vocab-popout' data-vocab-id='1010'>運転（うんてん）</span>免許（めんきょ）を取（と）っ<strong>てみせる</strong><span class='gp-popout' data-gp-id='78'>よ</span>。」

<div class='writeup-body'><span class='gp-popout' data-gp-id='852'>て見（み）せる</span>, primarily written in hiragana, is an emphatic structure that indicates that the speaker is going to do (A) in a way that it is clear to the listener. This can be translated as 'I will definitely (A)', or 'I swear I will (A)', but the literal translation of 'I will show you that I'll do (A)' also makes the point clear.<br>
To use <span class='gp-popout' data-gp-id='852'>てみせる</span>, simply alter the verb preceding it into its て-form.<ul class='writeup-examples--holder'>
 <li class='writeup-example'>
<div class='writeup-example--japanese'>
お前（まえ）のために、次（つぎ）の試合（しあい）では勝（か）っ<span class='gp-popout' data-gp-id='852'>てみせる</span>！</div><div class='writeup-example--english'>
I will definitely win the next competition for you!</div></li><li class='writeup-example'><div class='writeup-example--japanese'>


来週（らいしゅう）のテストで合格（ごうかく）し<span class='gp-popout' data-gp-id='852'>てみせる</span>！</div><div class='writeup-example--english'>
I will definitely pass the test next week!</div></li><li class='writeup-example'><div class='writeup-example--japanese'>


足（あし）が痛（いた）いけど、完走（かんそう）させ<span class='gp-popout' data-gp-id='852'>てみせる</span>！</div><div class='writeup-example--english'>
My legs hurt, but I am definitely going to finish the race!</div></li></ul>
Due to みせる requiring a target for who the speaker is showing, this grammar pattern will only be used when there is either directly someone that will be shown (A), or when the speaker is talking about showing someone (A) that does not happen to be there at the moment either physically or temporally. It will not be used when simply strongly stating that you will do (A), unless who sees that (A) is important. In a sentence like this, where the person being shown is not obvious, it will come across as 'I'll show everyone'.<br>
As <span class='gp-popout' data-gp-id='852'>て見（み）せる</span> literally just means to 'show (A)', it will often be used without any special emphasis. Whether it is being used emphatically or not will usually be obvious from the overall context of the sentence.</div>

Grammar Info

～て見(み)せる

I will definitely, I will certainly, just watch, whatever it takes, I swear, for sure