4WD

\fˈɔː dˌʌbə͡ljˌuːdˈiː], \fˈɔː dˌʌbə‍ljˌuːdˈiː], \f_ˈɔː d_ˌʌ_b_əl_j_ˌuː_d_ˈiː]\
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2006 - WordNet 3.0
By Princeton University
 
2011 - English Dictionary Database
By DataStellar Co., Ltd