expression, godan verb (-su)
grant a moment; spare a moment; give someone the time of day
Used when someone agrees to meet or talk briefly, often as a favor. The literal meaning is 'lend one's face', implying showing up or making an appearance for someone.
ちょっと顔を貸してくれないか。
Could you spare me a moment?
忙しいところ申し訳ないが、少し顔を貸し
Sorry to bother you when you're busy, but I'd appreciate it if you could give me a moment.