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Definitions4 characters
lao2 xin1 ku3 si1
to rack one's brains/to think hard
Usage•••frequent
Pronunciations

As word

1
lao2
to rack one's brains/to think hard
2
xin1
to rack one's brains/to think hard
3
ku3
to rack one's brains/to think hard
4
si1
to rack one's brains/to think hard