Senses
老底 background
The true story or inside information about someone's past or a situation; details that are usually kept hidden.
老底 patrimony
Family property or savings handed down over generations; an accumulated nest egg.
老底 backing
Something to fall back on; a source of confidence or support that allows one to act without fear.
老底 father
(archaic or crude) A term used to refer to one's own father.