speak up phr v [I] 1spoken used to ask someone to speak more loudly 【口】 提高声音说，大声点说〔用于要求别人〕: Could you speak up please, I can't hear you. 你说大声一点好吗，我听不见。 2 to say publicly what you think about something 公开地说出〔自己的想法〕: If we don't speak up nobody can help us. 如果我们不公开表达意见，没有人能帮助我们。