kiss

• kiss
• 1 [intransitive and transitive] to touch someone with your lips as a greeting, to show them love, or as part of a sexual relationship:
• Maggie leaned forward and kissed her cheek.
• Georgina took him in her arms and kissed him on the lips.
• Jim and Mary kissed (=they kissed each other).
• kiss somebody gently/lightly
• He kissed her gently and stroked her hair.
• kiss somebody goodbye/goodnight etc
• Kiss Daddy goodnight.
• 2 [transitive] to touch something with your lips as a sign of respect:
• She raised the crucifix to her lips and kissed it.
• 3

   kiss goodbye to something/kiss something goodbye

  informal to accept that you will lose something or lose an opportunity to do something:
• She knew if she concentrated on her marriage she could kiss her career goodbye.
• 4

   kiss something better

  spoken used, especially to a child, to say that you will take away the pain of something by kissing them:
• Here, let Mommy kiss it better.
• 5

   kiss my ass

  American English informal not polite an insulting expression used to show that you do not respect someone
• 6

   kiss (somebody's) ass

  American English informal not polite to be too nice to someone who can give you something you want - used to show disapproval
• 7 [transitive] literary if the wind, sun etc kisses something, it gently moves or touches it

• kiss up to somebody 

  phrasal verb
• to try to please someone in order to get them to do something for you - used to show disapproval [= suck up to British English]
• If you say that, it'll look like you're kissing up to me.

Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.