What word or phrase does your mother always say?
1560s, from Late Latin emanationem (nominative emanatio), noun of action from past participle stem of Latin emanare "flow out, arise, proceed," from ex- "out" (see ex-) + manare "to flow," from PIE root *ma- "damp."
emanation em·a·na·tion (ěm'ə-nā'shən)
Something that issues from a source; an emission.
Any of several radioactive gases that are isotopes of radon and are products of radioactive decay.