思(おも)いつくto think of, to hit upon, to come into one's mind, to be struck with an idea

良(よ)い計画(けいかく)を思(おも)いつきました。

I came up with a good plan. {to think of, to hit upon, to come into one's mind, to be struck with an idea}

その殺人(さつじん)犯(はん)はホラー映画(えいが)から犯行(はんこう)を思(おも)いついた。

The murderer got the idea for the crime from a horror movie. {to think of, to hit upon, to come into one's mind, to be struck with an idea}

同僚(どうりょう)：「急用(きゅうよう)を思(おも)いついたから、今日(きょう)は先(さき)に帰(かえ)るね！」

Colleague: 'I just thought of something urgent, so I'll be leaving early today!' {to think of, to hit upon, to come into one's mind, to be struck with an idea}

睡眠(すいみん)不足(ぶそく)の時(とき)に素晴(すば)らしい考(かんが)えを思(おも)いつく事(こと)なんて、ありっこないよ。

There's no way you can come up with great ideas when you're lacking sleep. {to think of, to hit upon, to come into one's mind, to be struck with an idea}

あの社員(しゃいん)は頻繁(ひんぱん)に名案(めいあん)を思(おも)いつくので、給料(きゅうりょう)を上(あ)げるよりほかないです。

That employee frequently comes up with brilliant ideas, so there's no choice but to raise their salary. {to think of, to hit upon, to come into one's mind, to be struck with an idea}