Liplock is a term used to describe a KISS that involves both partners pressing their lips together for an extended period of time. It is often seen as a more intimate form of kissing than a traditional KISS, and is usually done as a sign of affection or love. The term 'Liplock' can also be used to refer to a situation in which two people are unable to separate due to a strong emotional connection. In the context of a crossword puzzle, the term 'KISS' is used as a four-letter solution for the term 'Liplock'.