fair-weather friend

person who stops being a friend when one is in trouble 顺境中的朋友（不能共患难者）.

faience, fail, fail in, fail to, fail-safe, failing, failure, faint, faint-hearted, faint-heartedly, faint-heartedness, fainthearted, faintly, faintness, fair, fair copy, fair play, fair-haired, fair-minded, fair-to-middling, fairground, fairly, fairness, fairway, fairy, fairy godmother, fairy lights, fairy story, fairy-tale, fairy tale, fairy-tale, fairyland, fait accompli, faith, faith-cure, faith-healer, faithful, faithfully, faithfulness, faithless, faithlessly,