belong together

fool away fork over fill out flea in (one's) ear at fault play someone false build a fire under foul out fly in the face of at the expense of gang up on feather in one's cap follow up fat chance quite a few play footsie with in full food for thought throw down the gauntlet feel like oneself lay eyes on get to first base take exception play to the gallery face to face sweep one off one's feet every once in a while without fail so far so good catch fire