Components
首になる is an exact match with one form of the following word:
くびになる
BOOST
expression, 'ru' godan verb
1. to be sacked; to be fired; to be dismissed  (often written with kana only)
2. to be beheaded
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My current mastery of くびになる:
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Usefulness and usage:
Kanshudo usefulness level: 6 (among the 15,000 most useful words in Japanese)
• Kanshudo usefulness level is based on a usefulness score of 78,434 which gives a rank of 10,609
くびになる is the most useful form. 3 additional forms are shown below.
• This form is used about 80% of the time
• Google Japan frequency rank: 8,000 (about 103,000,000 results)
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Example sentences:
あの
れんちゅう
連中
けいそつ
軽率
しごと
仕事
のろかったからくびになった
They got the sack for being careless and tardy.
かれ
しごと
仕事
くびになってから
こんきゅう
困窮
している

He has been in deep water since he got fired from his job.
しゃちょう
社長
あんなこと
った
からには
ぼく
くびになる
かくじつ
確実

After I said such a thing to my boss, I am certain to lose my job.
首になる
BOOST
Reading : くびになる   
My flashcards:
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Usefulness and usage:
• This form is used about 20% of the time
• Google Japan frequency rank: 22,000 (about 29,300,000 results)
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クビになる
BOOST
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Usefulness and usage:
• This form is rarely used
• Google Japan frequency rank: 123,000 (about 972,000 results)
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首に成る
BOOST
Reading : くびになる   
My flashcards:
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Usefulness and usage:
• This form is rarely used
• Google Japan frequency rank: 166,000 (about 461,000 results)
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シュ   くび neck; head   
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ジ   シ   みずか self   
grass   
セイ   ジョウ   な to become   な to perform, to accomplish   
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tasseled spear
wrap
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