catch up (with sb); catch sb up to reach sb who is in front of you 赶上: Sharon's missed so much school she'll have to work hard to catch up with the rest of the class.沙伦缺了那么多课,她得努力学习才能赶上班里的其他人。Go on ahead, I'll catch you up in a minute.你只管走你的,我一会儿就赶上你。