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Glass formation is usually related to deep eutectic points. The present work addresses the composition interpretation of eutectic Ti57Cu43 and relevant bulk metallic glasses (BMGs) by introducing the “dual-cluster” model. In this model, the eutectic liquid structure is presumably composed of two chemical units derived from relevant eutectic phases, each corresponding to a stable liquid satisfying a general cluster formula for ideal metallic glasses [cluster](glue atom)1or3 in terms of the cluster-plus-glue-atom model. Detailed procedures are introduced to apply this model in interpreting the eutectics, based on which eutectic Ti57Cu43 is interpreted as dual-cluster formulas of 2{[Ti–Cu6Ti8]Cu3} + [Ti–Cu5Ti9]Ti3 and 2{[Ti–Cu6Ti8]Cu2Ti} + [Ti–Cu5Ti9]Cu2Ti, where the two clusters [Ti–Cu6Ti8] and [Ti–Cu5Ti9] are, respectively, derived from eutectic phases TiCu and Ti2Cu. Two interpretations are equivalent, and one of the involved chemical units [Ti–Cu6Ti8]Cu3 = Ti50Cu50 is a basic unit for multicomponent Ti–Cu-based BMGs; typical BMGs are formed by replacing the atoms in the basic unit with alloying ones.