weasel (one's) way in(to something)
To succeed in entering some location, position, situation, etc., through tricky, sneaky, or deceitful means. He has no qualifications or relevant experience, but he managed to weasel his way into a managerial position because his dad is friends with the CEO. I thought Mike had finally gotten Sarah out of his life after everything she had put him through, but it seems that she's weaseled her way back in.
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