chum up ÀǹÌ: Ä£ÇÏ°Ô ´ëÇÏ´Ù; Ä£ÇØÁö´Ù ¿¹½Ã: There was one woman who had been very keen to look after me, and chum up with me. He hasn't been in there and chummed up to them for years. I chummed up with a few of my new work colleagues.