1 [U] a type of soft white rock 白垩: chalk cliffs白垩崖
2 [C,U] a small stick of soft white or coloured rock that is used for writing or drawing 粉笔
chalk²
/tʃɔ:k ||; tʃɔk/verb [I,T] to write or draw sth with chalk 用粉笔写或画: Somebody had chalked a message on the wall.有人用粉笔在墙上留言。chalk sth up to succeed in getting sth 赢得；顺利获得: The team has chalked up five wins this summer.这支球队今年夏天已经赢了五场赛事。