play footsie with someone
play footsie(s) (with someone)
1. To rub someone's foot or feet with one's own, usually in secret beneath a table as a means of flirting or indicating romantic or sexual interest. My friend's sister started playing footsie with me during dinner. I had no idea she was into me! Are you two playing footsies?
2. By extension, to become secretly involved with someone; to offer clandestine cooperation with someone to gain their favor. It's been revealed that the senator has been playing footsie with major corporations to bypass federal regulations and bureaucratic red tape.
See also: play