To fear that there will be no proof or evidence later; a phrase often used in old contracts and agreements to emphasize the need for documentation.
这笔借款数额不小，我们还是写个字据，恐后无凭，免得日后说不清楚。
As this loan is a substantial amount, we should still write an IOU, for fear of having no proof later, to avoid any disputes in the future.
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