TOEICにも役立つビジネス英語：firm up something
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ビジネス英語：firm up something(if somebody firms up an arrangement, an agreement, etc. it becomes more definite or less likely to change)
Examples:
1. The bank is expected to firm up plans later in the year.
2. We are looking at all the issues before firming up our offer.
3. The details of the agreement haven't been firmed up yet.
（取り決め、合意などを固めること）