Grammar detail: わけにはいかない

わけにはいかない - can't very well do
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Although this expression can be rather subtle, it can be very useful, along with its counterpart 〜ないわけにはいかない.
Adding 'わけにはいかない' to a plain form sentence has the meaning 'can't very well ~'. This phrase actually means what you would expect from a literal translation, which would be something like 'with that reason, it (just) won't go'. This is a surprisingly useful phrase, as it's a way to express a halfway house between '(physically) cannot do' (できない) and 'will not do'. Here's an example:
I can't very well be satisfied with the way things are.
Perhaps because it's so useful, this phrase comes in a variety of politeness levels, from the standard plain form version above, right up to the hyper-polite わけにはまいりません. A great example is いただくわけにはまいりません, which is a hyper-polite form of もらうわけにはいかない - a very Japanese phrase you might use when somebody offers you something, meaning 'I can't very well receive (that)'.
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See also:
  • わけ - reason
  • ないわけにはいかない - can't very well not do; have to do

Kanji used in this grammar

ノウ   ナッ   ナ   ナン   トウ payment, settlement   おさめる to supply   おさまる to be installed   
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トク    profit   え    う to acquire   
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