и ежу понятно

• (И) ЕЖУ ПОНЯТНО highly coll

[these forms only; subj-compl with быть (subj: это or a clause), pres only; fixed WO]

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⇒ the essence of some statement (action, fact etc) is so obvious, so clear that it is impossible not to understand it:

- это{{}}и ежу понятно ≈ anyone (any fool, any half-wit etc) could tell (see) (that);

- it's (as) plain as day.

     ♦ Нина говорит, что не красит волосы, но и ежу понятно, что это неправда. Nina says she doesn't dye her hair, but any fool can see it's not true.