one half (of split coconut; betel nut; etc.); one of a pair (e.g. one leg; one eye; etc.); neighboring house; adjoining building; next door to; across the street from any area adjacent to.
> Our nose is close (to the mouth), but cannot be licked.
i.e. we shouldn't be too sure of, or overconfident in, ourselves. The nose is very close to the mouth, but, no matter how reassuringly available, it cannot be licked by the tongue. The idiom cautions those who are careless with their possessions to be less assured about wealth.