EXPANSION BOLT

\ɛkspˈanʃən bˈə͡ʊlt], \ɛkspˈanʃən bˈə‍ʊlt], \ɛ_k_s_p_ˈa_n_ʃ_ə_n b_ˈəʊ_l_t]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd