expression, ichidan verb
make advances; woo; work on someone
Used for romantic or flirtatious approaches, often with a slightly playful or colloquial tone.
彼は彼女にモーションをかけたが、相手にされなかった。
He made advances toward her, but she didn't give him the time of day.
合コンで積極的にモーションをかけるタイプだ。
He's the type who actively makes moves at group dates.