Metaphor expression, especially consisting of a noun and verb, is irregular expression thus it is not easy to be dealt with in natural language applications such as machine translation, summarization, and document understanding. We believe it is important that metaphor expressions should be paraphrased into normalized basic expressions in order to extract a fact embedded in the expression: for example a metaphor expression "the wind plays" can be paraphrased into a basic expression "the wind blows". In order to realize this task, in this paper we propose a verb thesaurus organized on the basis of semantic coherency for verbs. From the work of manual construction of a thesaurus on 50 verbs we discuss the possibility of our approach.