彼此
bǐcǐ · HSK 5
each other
🔄 彼此 = that + this → 'that one and this one' = each other
彼 means 'that/those' and 此 means 'this/these', so 彼此 literally pairs 'that-side' with 'this-side' to mean 'both sides' or 'each other'. Also used as a polite echo: 'same to you / I/me too'.
此 — foot 止 + spoon/person 匕
此 originally depicted a person (匕) standing with a foot (止), suggesting 'to stop here' or 'this place.' Over time the meaning generalized from a specific location to the demonstrative pronoun 'this.' The foot component still hints at the original sense of standing in a particular spot.