Synonym: answer, clue, explanation, lead, note, opener, pitch, tone. Similar words: turkey, hockey, monkey. Meaning: [kɪː] 
n. 1. metal device shaped in such a way that when it is inserted into the appropriate lock the lock's mechanism can be rotated 2. something crucial for explaining 3. pitch of the voice 4. any of 24 major or minor diatonic scales that provide the tonal framework for a piece of music 5. a kilogram of a narcotic drug 6. a winged often one-seed indehiscent fruit as of the ash or elm or maple 7. United States lawyer and poet who wrote a poem after witnessing the British attack on Baltimore during the War of 1812; the poem was later set to music and entitled `The Star-Spangled Banner' (1779-1843) 8. a coral reef off the southern coast of Florida 9. (basketball) a space (including the foul line) in front of the basket at each end of a basketball court; usually painted a different color from the rest of the court 10. a list of answers to a test 11. a list of words or phrases that explain symbols or abbreviations 12. a generic term for any device whose possession entitles the holder to a means of access 13. mechanical device used to wind another device that is driven by a spring (as a clock) 14. the central building block at the top of an arch or vault 15. a lever that actuates a mechanism when depressed. v. 1. identify as in botany or biology, for example 2. provide with a key 3. vandalize a car by scratching the sides with a key 4. regulate the musical pitch of 5. harmonize with or adjust to. adj. 1. serving as an essential component 2. effective; producing a desired effect.
n. 1. metal device shaped in such a way that when it is inserted into the appropriate lock the lock's mechanism can be rotated 2. something crucial for explaining 3. pitch of the voice 4. any of 24 major or minor diatonic scales that provide the tonal framework for a piece of music 5. a kilogram of a narcotic drug 6. a winged often one-seed indehiscent fruit as of the ash or elm or maple 7. United States lawyer and poet who wrote a poem after witnessing the British attack on Baltimore during the War of 1812; the poem was later set to music and entitled `The Star-Spangled Banner' (1779-1843) 8. a coral reef off the southern coast of Florida 9. (basketball) a space (including the foul line) in front of the basket at each end of a basketball court; usually painted a different color from the rest of the court 10. a list of answers to a test 11. a list of words or phrases that explain symbols or abbreviations 12. a generic term for any device whose possession entitles the holder to a means of access 13. mechanical device used to wind another device that is driven by a spring (as a clock) 14. the central building block at the top of an arch or vault 15. a lever that actuates a mechanism when depressed. v. 1. identify as in botany or biology, for example 2. provide with a key 3. vandalize a car by scratching the sides with a key 4. regulate the musical pitch of 5. harmonize with or adjust to. adj. 1. serving as an essential component 2. effective; producing a desired effect. 
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1) Sloth is the key of [to] poverty. 
2) The wife is the key of the house.
3) A golden key opens every door.
4) Doubt is the key of knowledge.
5) A golden key can open any door.
6) The used key is always bright.
7) Money is the key that opens all doors.
8) Idleness is the key of beggary.
9) Idleness is the key of beggary, and the root of all evil.
10) Knowledge is a Treasure, but Practice is the key to it.
11) Knowledge is a treasure,(http://sentencedict.com/key.html) but practice is the key to it. Lao Tzu
12) Insert the key in/into the lock.
13) The key fell on the ground with a jingle.
14) I saw you put the key in your pocket.
15) Too much force will twist the key.
16) We made a duplicate of the key.
17) Confidence is the key to success.
18) Use this key to toggle between the two typefaces.
19) Education was the key to upward social mobility.
20) Transport has always been the key to developing trade.
21) He turned the key in the lock.
22) There's a special key for winding up this clock.
23) He fumbled the key into the ignition.
24) I'd like a key to room 809, please.
25) I left my key inside my room.
26) Her key hung on a string around her neck.
27) He opened the door with his key.
28) She got the key stuck in the lock.
29) Sloth is the key of poverty.
30) I'd like to have another key, if that's ok.