串门 chuànmén to call on somebody
to call on somebody; to drop in; to visit somebody's home
How to remember 串门: 串 string + 门 door = to call on somebody.
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How it is used
- To drop by a neighbor's or friend's home for a casual visit - 没事就去邻居家串门 (méishì jiù qù línjū jiā chuànmén) I pop over to the neighbors' when I've got nothing to do.
- Colloquial, homey; 串门儿 with the 儿 is common in the north.
- Implies informal, unannounced social visiting, not a formal appointment.