be already too late; be a bit too late; belated action (/advice /effort) ? 你們的支援是～，于嘛不早點來呢？Your support is a bit too late. Why didn’t you come here earlier?
馬后炮ma hou pao
belated action or advice
馬后炮
fire belated shots;take belated action;offer belated advice;make belated efforts 放～give advice after the event;be a Monday morning quarterback