(slang) To expend all of one's resources or efforts; to express all the arguments or ideas which one has. / (slang) To spend all of one's money. / (slang, vulgar, of a man) To ejaculate.

present participle of befall

(physics) A rare stable isotope of neon, ²¹₁₀Ne, having ten protons and eleven neutrons; it amounts to less than 0.3% of the element in nature

Removal of registration, especially: / The process by which an employee is removed from work registrant status.