I would like these tags to be merged under "dropdown", most common tag used by SO-pedians. This is how it now stands.  

[dropdown](/questions/tagged/dropdown "show questions tagged 'dropdown'") (4671 questions).  

[drop-down](/questions/tagged/drop-down "show questions tagged 'drop-down'") (67 questions).  

[drop-down-menu](/questions/tagged/drop-down-menu "show questions tagged 'drop-down-menu'") (501 questions).  

[css-dropdown](/questions/tagged/css-dropdown "show questions tagged 'css-dropdown'") (7 questions).