be somebody's man/woman

be (one's) man/woman

To be the person that can help one due to possessing something in particular, such as a skill, access to something, etc. If you need help with your taxes, Teresa's your woman—she's something of an expert. I'm trying to score tickets for the sold-out concert, and Dave told me that you're my man.
See also: man, woman
Farlex Dictionary of Idioms.

be somebody’s ˈman/ˈwoman

be the best person to do a particular job, etc: If you need a driver, then I’m your man. If you need a good music teacher, she’s your woman.
See also: man, woman
Farlex Partner Idioms Dictionary
See also:
  • be (one's) man/woman
  • give (one) a/the feel of (something)
  • cast
  • cast (some) light on (something)
  • cast/shed/throw light on something
  • shed light on
  • shed (some) light on (something)
  • cast (some) light upon (something)
  • shed (some) light upon (something)
  • ploughs