Components
さえる is an exact match with one form of the following word:
冴える
BOOST
Reading : さえる   
ichidan verb, intransitive verb
1. to be clear (of a sight, sound, colour, etc.); to be bright; to be vivid; to be crisp
2. to be clear-headed; to be alert; to be on the ball; to be wide awake
3. to look upbeat; to be perky; to be cheerful  (often as 冴えない)
4. to master (a skill); to excel at; to cleanly execute
5. to be satisfying  (see also: 冴えない; often as 冴えない)
6. to become frigid; to become intensely cold  (original meaning, now somewhat old-fashioned)
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My current mastery of 冴える:
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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 71,410 which gives a rank of 15,893
冴える is the most useful form. 2 additional forms are shown below.
• This form is used about 80% of the time
• Google Japan frequency rank: 108,000 (about 1,490,000 results)
• This form appears in Wikipedia's list of JLPT N1 vocabulary (see JLPT collections)
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
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Example sentences:
コーヒー
いっぱい
一杯
あたま
える

I feel more alert after drinking a cup of coffee.
そのパフォーマンス
えない
ものでした
The performance was low-keyed.
きのう
昨日
ゆっくり
やす
んだ
ぶん
きょう
今日
あたま
えている

I feel smart today, to a degree that is in proportion to the amount of good rest I had yesterday.
さえる
BOOST
My flashcards:
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Usefulness and usage:
• This form is used about 20% of the time
• Google Japan frequency rank: 195,000 (about 304,000 results)
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
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冱える
BOOST
Reading : さえる   
My flashcards:
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Usefulness and usage:
• This form is rarely used
• Google Japan frequency rank: 253,000 (about 5,680 results)
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wide awake   さえる to be wide awake, clear (eyed)   
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ice   
ガ   ゲ   きば tusk, tooth, fang   
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katakana 'no'; whereupon; splitting away from
ウ    from   
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ニ   ふた    ふた two   
hook
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