咱
zán
variant of 咱[zan2]
This is a pronoun — its meaning is referential rather than compositional.
咱今天去公园玩吧。
zán jīn tiān qù gōng yuán wán ba。
Let's go to the park today.
咱都是一家人，有事一起扛。
zán dōu shì yī jiā rén， yǒu shì yī qǐ káng。
We are all family; if something comes up, we bear it together.