catch up on

赶上，补上

catalyze, catamaran, catapult, cataract, catarrh, catastrophe, catastrophic, catastrophically, catcall, catch, catch at, catch crop, catch fire, catch on, catch one's breath, catch one's eye, catch sb.'s eye, catch sight of, catch the eye, catch up, catch up with, catch-all, catcher, catching, catchment area, catchpenny, catchphrase, catchword, catchy, catechism, catechize, catechise, categorical, categorically, categorize, categorize, -ise, category, cater, caterer, catering, caterpillar,