Old English wir "metal drawn out into a thread," from Proto-Germanic *wiraz (cf. Old Norse viravirka "filigree work," Swedish vira "to twist," Old High German wiara "fine gold work"), from PIE *wei- "to turn, twist, plait" (cf. Old Irish fiar, Welsh gwyr "bent, crooked;" Latin viere "to bend, twist," viriæ "bracelets," of Celtic origin). Wiretapping is recorded from 1904, from earlier wiretapper (1893). Wirepuller in the political sense is 1848, American English.
Just in time: “Nancy mailed off her application, and it got in just under the wire.” From horse racing, in which the wire marks the finish line.
Illegal; secret and illicit; unethical: He would never make any deals under the table (1940s+)
To cancel or ignore what has gone before; begin anew; go back to square one: Let's just wipe the slate clean and pretend it never happened (1921+)