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〜まい
mai-4
JLPT N2
Edit  Amatuka
Meaning
Don't do ~
Don't let this get out.
Edit  Amatuka
Formation
Phrases
もんだいがおこれば、がっこうだけでなんとかしよう、そとにはもらすまい。
If some trouble crops up, sort it out somehow or other in school - don't let it leak outside.
Edit  #494 Amatuka
いちへいたりとものがすまいぞ!(
Don't even let a single enemy soldier escape!
Edit  #2896 bamboo4
あいつはそこまではやるまい。
I don't think he would dare go that far.
Edit  #2897 bamboo4
Discussion and comments
somehow or other
ぜひ何とかして、どうやらこうやら、どういう訳だか、どうかこうか
Miki
まい is kinda like ないだろう, or ないとおもう I guess.
Also its pretty formal and not used much in conversation nowadays.
pgb
Depending on context, まい has stronger meaning.
ex#494, you can repalce with 〜してはならない
ex#2896, 〜しないつもりだ
ex#2987, 〜ないと思う
Miki
#2869, you can replace まいぞ with 逃してはいけない
bamboo4