错过 (cuò guò) means to miss something you intended to catch or attend, like a train, opportunity, or phone call — it implies you were too late or it passed you by. 遗漏 (yí lòu) is different: it means to overlook or omit something inadvertently, like forgetting to include an item on a list. Use 错过 for missing events or chances; use 遗漏 for accidentally leaving something out.