□ have a lot of irons in the fire やりかけの仕事がたくさんある
ex) We won't be able to talk long as we have a lot of irons in the fire.
たくさんやることがあるので、話す時間がないかも知れない
irons in the fire: activities or projects that someone is involved in
ex)Although he won't say exactly what he's working on now, he says he has quite a few irons in the fire.