掛在嘴上 [ㄍㄨㄚˋ ˙ㄗㄞ ㄗㄨㄟˇ ˙ㄕㄤ; gua4 zai5 zui3 shang5] to pay lip service to to keep mentioning (without doing anything) to blather on about sth ◄ ►