lock对应的反义词是unlock。
lock的基本意思是“锁上”“锁住”，也可表示“卡住”，引申可作“使…固定”解。比如：The ship was locked in the ice through the winter.（整个冬天船只被冻在冰层里。）
unlock做动词意思是锁；开启；揭开；显露。比如：She fail to unlock the safe in spite of all her exertion.（她虽然费尽力气，仍未能将那保险箱的锁打开。）
lock做名词的用法
1、Did you lock the door?你锁门了吗？这句话中lock的意思是锁上、被锁住、用锁锁上。
2、She locked her passport and money in the safe.她把自己的护照和钱锁在了保险柜里。这句话中locked是lock的过去式，意思是把…锁起来。
3、He locked his helmet into position with a click.他喀哒一声把头盔扣好。这句话中locked是lock的过去式，意思是（使）固定、卡住、塞住。
4、The two sides are locked into a bitter dispute.双方陷入了激烈的争论。这句话中locked是lock的过去分词，意思是陷入、卷入（困境、争论、争执等）。
DPWX遁遁
