to allow yourself to enjoy something completely

My idea of a holiday is to stay in a five-star hotel and just wallow in luxury for a week. 我的假期设想是预订一家五星级的酒店，纵情享受奢华的一周。

to remain in an unhappy emotional state without trying to get out of it, as if you are enjoying it or trying to get sympathy from other people

I wish she'd do something to help herself instead of just wallowing in self-pity! 我希望她能做一些自助的事，而不是沉湎于自怨自艾之中！