ときめきbeating (of the heart, with joy, excitement, etc.), palpitation, throbbing, pounding, fluttering

イケメンを見(み)てトキメキを覚(おぼ)えた。

Upon seeing the handsome guy, I felt my heart fluttering. {beating (of the heart, with joy, excitement, etc.), palpitation, throbbing, pounding, fluttering}

新(あたら)しい場所(ばしょ)での生活(せいかつ)にトキメキを覚(おぼ)えました。

I felt a flutter of excitement living in the new place. {beating (of the heart, with joy, excitement, etc.), palpitation, throbbing, pounding, fluttering}

胸(むね)のトキメキを抑(おさ)えるために瞑想(めいそう)をすることにした。

I decided to meditate in order to suppress the palpitations in my chest. {beating (of the heart, with joy, excitement, etc.), palpitation, throbbing, pounding, fluttering}

誰(だれ)かにトキメキを与(あた)えるのがアイドルの仕事(しごと)だと言(い)えます。

You could say that it's an idol's job to give someone a fluttering or throbbing of the heart. {beating (of the heart, with joy, excitement, etc.), palpitation, throbbing, pounding, fluttering}

恋愛(れんあい)には疎(うと)い人生(じんせい)で、誰(だれ)かにトキメキを覚(おぼ)えたことは一(いち)度(ど)もない。

In a life unfamiliar with love, I have never experienced a fluttering heart for anyone. {beating (of the heart, with joy, excitement, etc.), palpitation, throbbing, pounding, fluttering}