combination lock
Longman Dictionary of Contemporary English 5++LDOCE 5++ˌcombiˈnation lock noun [countable] 
TDa lock which can only be opened by using a series of numbers or letters in a particular order 密码锁，转字锁 →5 see picture at 见图 lock2
TDa lock which can only be opened by using a series of numbers or letters in a particular order 密码锁，转字锁 →5 see picture at 见图 lock2Examples from the Corpus
combination lock• Next to it was a steel security cupboard fitted with a combination lock.• I took it down from the wall to reveal the circular door of a wall safe with a combination lock.• The case sported matching brass hardware, including a pair of clasps, each with its own three-number combination lock.• The only thing holding me up would be fumbling at the combination lock or renting a towel.• Remember the analogy of the combination lock.ˌcombiˈnation lock nounChineseSyllable
be lock Corpus only which by opened a can
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combination lock
ˌcombiˈnation lock
noun [countable]
a lock which can only be opened by using a series of numbers or letters in a particular order
ˌcombiˈnation lock
noun [countable]a lock which can only be opened by using a series of numbers or letters in a particular order