get to the bottom of

get to the bottom ofget to the bottom of1.■弄清…底细We must get to the bottom of the matter.我们必须弄清这件事的内情。

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get to the bottom of1.■了解…的底细，弄清(或探明)…的真相，弄清…的起因，寻到…的根子，详细调查，把…弄个水落石出