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criterion; standard; yardstick; reference; aim
rough estimate; approximation
予算の目安を教えてもらえると助かります。
It would help if I could get you to tell me the budget guideline.
料理の時間は目安として三十分くらいだと思う。
I think the cooking time is about thirty minutes as a guideline.
この金額を目安に計画を立ててみましょうか。
Shall we make a plan using this amount as a guideline?