A favorite expression, catchphrase, or mantra that one frequently and habitually uses in conversation

A regularly or constantly used expression; a speech mannerism that one uses habitually or unconsciously. Also referred to as [[口头禅|口頭禪|kou3 tou2 chan2]].

a friend with whom one is on speaking terms but not close; a superficial friendship

a surface friendship that exists in name only or is based on empty words; a relationship where the friends are not truly close

Literature that is passed down through word of mouth rather than written records; folk tales