戒 means 'warn'

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Strokes : 7    Frequency: 1390   JLPT: N1    Usefulness: 5    Study set: 5-20    Grade: 8   Intermediate lesson: -    Beginner lesson: -   Begins 16 words   Used in 71 words   Used in 71 names   Component in 5 kanji (1 Jōyō)
Jōyō (常用)
   いましめる to warn, admonish
⿹   tasseled spear   twenty  
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In the most useful 10,000 words in Japanese, 戒 is used 4 times, read 2 ways.
Across all words in Japanese, 戒 is used 70 times, read 2 ways.
カイ : 65 words FIND ALL
1. vigilance; precaution; watch; lookout; alertness
2. to be vigilant; to be cautious; to guard (against)
(click the word for examples and links)
いましめる : 5 words FIND ALL
0 4
1. caution; admonition; warning; lesson
2. prohibition; ban; commandment; precept  (also written as 禁め)
(click the word to view an additional 2 meanings and 3 forms, examples and links)
An additional one less common word includes 戒 but the reading has not yet been categorized.
Henshall: 1060  Joy o' Kanji : 1060  Key to Kanji:

Cascading kanji view

カイ   いましめる to warn, admonish   
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twenty; two hands   
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ジュウ   ジッ   と    とお ten   
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イチ   イツ   ひと    ひと- one   
tasseled spear
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