To have a secret plan or idea.
秘密の計画やアイデアを持っている。 (Himitsu no keikaku ya aidea o motte iru.)
"Don’t worry, he has something up his sleeve for the project."
"心配しないで、彼はこのプロジェクトのために袖の中に何かがある。" (Shinpai shinaide, kare wa kono purojekuto no tame ni **sode no naka ni nanika ga aru**.)
a perfect couple, very well suited for each other
A pleasant or ideal situation; often used ironically
to feel extreme fear or anxiety
to focus closely on something
to increase pressure or intensity
to send someone a short message or note