1a touch or caress with the lips:a quick kiss on the cheek
used to express affection at the end of a letter (conventionally represented by the letter X):she sent lots of love and a whole line of kisses
2 Billiards & Snooker a slight touch of a ball against another ball.
3North American a small cake, biscuit, or sweet.
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Universal
touch or caress with the lips as a sign of love, sexual desire, or greeting:he kissed her on the lips [with object and complement]:she kissed the children goodnight [no object]:we started kissing
Billiards & Snooker (of a ball) lightly touch (another ball) in passing.
kiss and make up
become reconciled.
kiss and tell
recount one’s sexual exploits, especially to the media concerning a famous person: [as modifier]:this isn’t a kiss-and-tell book
kiss someone's arse (or North Americanass)
vulgar slang behave obsequiously towards someone.
kiss ass
North American vulgar slang behave in an obsequious or sycophantic way.
kiss something better
informal comfort a sick or injured person, especially a child, by kissing the sore or injured part of their body as a gesture of removing pain.
kiss something goodbye (or kiss goodbye to something)
informal accept the certain loss of something:I could kiss my career goodbye
kiss of death
an action or event that causes certain failure for an enterprise:it would be the kiss of death for the company if it could be proved that the food was unsafe
kiss of life
mouth-to-mouth resuscitation.
an action or event that revives a failing enterprise:good ratings gave the programme the kiss of life
kiss of peace
a ceremonial kiss given or exchanged as a sign of unity, especially the act of kissing the consecrated elements during the Christian Eucharist.
kiss the rod
accept punishment submissively.
kiss someone/thing off
North American informal dismiss or reject someone or something abruptly.
kiss up to
North American informal behave sycophantically or obsequiously towards (someone) in order to obtain something.