noun · the mother of one's husband, used in literary or archaic contexts

她对翁姑十分孝顺。

noun · the sister of one's husband

我大姑子说明天要带着她的孩子来家里吃午饭。

noun · a female religious practitioner, especially a Buddhist nun

那位道姑在山顶的道观里修行多年。

noun · the sister of one's father

我大姑常带些好吃的点心来看奶奶。

adverb · for the time being; tentatively or provisionally

这件事姑且先放一放。