In this study, an attempt to resolve the issue of transparency between vehicle and topic in order for a better communication using simile expressions. The most desirable form of utilized vocabularies in which transparency has been resolved was set-up to be registrated as simile expressions and presented as figurative meanings. This was seen as extending vocabulary meaning, and thus possibility of extending meaning depending on its figurative meanings and their usage was observed. Fewer the figurative meaning owned by vocabularies and greater the fixedness of mainly used form of those vocabularies lead to interpreting it as having a greater possibility of extending vocabulary meaning. Depending on such possibility, extending meaning was classified into four types. Type 1 was registrating as an entry while Type 2, separate from entry, was presenting it in a format with connectors. In Type 3, presented vocabulary meanings were numbered to add figurative meanings. Lastly in Type 4, collocation was designated as idiomatic phrases. This study provides the fundamental research for resolving the issues of transparency between vehicle and topic in simile expressions, and raises the necessity of focusing on figurative meaning of vocabularies. (Yonsei University)