FluentPlex

key in

verb
  1. To enter data by keyboarding. (transitive)
  2. To make informed or aware, especially of something that others are not privy to. (transitive)
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From the library

However, on the second time round, she came upon a low curtain she had not noticed before, and behind it was a little door about fifteen inches high: she tried the little golden key in the lock, and to her great delight it fitted!
Alice's Adventures in Wonderland, p. 5 · B2
“I heard her shut the door, and felt quite sure that she had turned the key in the lock.”
The Memoirs of Sherlock Holmes, p. 95 · B2
To my surprise, he locked it after him and put the key in his pocket.
The Case-Book of Sherlock Holmes, p. 12 · B2
Then he arranged all his beautiful Turkish arms, his fine English guns, his Japanese china, his cups mounted in silver, his artistic bronzes by Feuchères or Barye; examined the cupboards, and placed the key in each; threw into a drawer of his secretaire, which he left open, all the pocket-money he had about him, and with it the thousand fancy jewels from his vases and his jewel-boxes; then he made an exact inventory of everything, and placed it in the most conspicuous part of the table, after putting aside the books and papers which had collected there.
The Count of Monte Cristo, p. 918 · C1

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.