lip service
noun [ U ] uk/ˈlɪp ˌsɜː.vɪs/ us/ˈlɪp ˌsɝː.vɪs/
pay lip service to something 口头上同意，口头上支持
to say that you agree with something but do nothing to support it
She claims to be in favour of training, but so far she's only paid lip service to the idea. 她声称对培训持赞成态度，但到目前为止她的赞成还仅仅停留在口头上。