leave (something) on the table
v. phr.— «He admitted he does have bad dreams occasionally about an estimator’s most dreaded mistake—“leaving something on the table”—in layman’s terms, forgetting to include a figure in a final estimate.» —“Construction-cost estimators can ruin builder with bad guess” Chicago Tribune June 24, 1973. (source: Double-Tongued Dictionary)
Further reading
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