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The act of touching or rubbing someone else's foot or ankle with one's own under a table, typically to show sexual interest in that person. Becky must like you if she was playing footsies with you all night at dinner.
play footsie (with someone)
1. Literally, 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!
2. 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.