let slip
偶然泄露(秘密等)
例句与用法：
She let slip some remarks about my daughter.
她无意中说出了一些有关我女儿的话。
She will never let slip a chance to study abroad.
她绝不会错过出国学习的机会。
She let slip a chance to work abroad.
她错过了出国工作的机会。
She let slip that she had not paid her tax.
她偶然说出她还没交税呢。