If youdescribethe way someonetreatsyou as akickin theteeth, youmeanthat thatpersontreatsyoubadlyandunfairly,especiallyat atimewhen you needtheirsupport:
（尤指在需要帮助时遭受的）恶劣待遇，严重打击She wasdismissedfrom herjob, which was arealkickin theteethafter all theworkshe'd done.她辛辛苦苦做了那么多工作之后被解雇了，这使她深受打击。