Components
蓋を開ける is an exact match with one form of the following word:
ふたを開ける
BOOST
Reading : ふたをあける   
expression, ichidan verb
1. to open the lid; to lift a lid  (opposite: 蓋を閉める)
2. to open the lid (on); to make public
3. to start (something)
4. to look at the results (consequences, outcome, effect); to look at the condition of something
5. to open (of a theatre)
My mastery:
My current mastery of ふたを開ける:
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Usefulness and usage:
Kanshudo usefulness level: 9 (among the 50,000 most useful words in Japanese)
• Kanshudo usefulness level is based on a usefulness score of 43,236 which gives a rank of 36,313
ふたを開ける is the most useful form. 1 additional form is shown below.
• This form is almost always used
• Google Japan frequency rank: 34,000 (about 16,700,000 results)
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Example sentences:
こころ
ふたを
ける
title of book, album etc.
Opening the Lid of One's Mind
ぜったい
絶対
トイレ
ふた
けた
ままにする
Whatever you do don't leave the lid up on the toilet!
蓋を開ける
BOOST
Reading : ふたをあける   
My flashcards:
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Usefulness and usage:
• This form is rarely used
• Google Japan frequency rank: 138,000 (about 671,000 results)
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カイ   あ to (be) open   あける    ひら to open (something)   ひらける to open out (eg view)   
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start, initiate   
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イチ   イツ   ひと    ひと- one   
twenty; two hands   
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ジュウ   ジッ   と    とお ten   
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stick   
モン   かど gate   
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ガイ   ふた lid   
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grass   
キョ   コ   さ leave   
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ム   private
ド   ト   ground; earth   つち ground, earth, soil   
さら dish   
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