Matching Pairs AllusionsOnline version Allusions by Cynthia Cox 1 Crocodile Tears 2 Once in a Blue Moon 3 Crossing the Rubicon 4 Pound of Flesh 5 Pearls Before Swine 6 Gordian Knot 7 Sound and Fury 8 Sirens 9 Mrs. Grundy 10 Betrayed with a Kiss 11 Achilles Heel 12 Read the Riot Act 13 Thirty Pieces of Silver 14 Sacred Cow 15 All That Glitters is not Gold 16 Ivory Tower something which appears valuable on the outside may in fact be less than valuable; appearances can be deceptive An attitude of narrow-minded prudishness To take an irreversible step, often involving some danger a supposed friend's treachery A vulnerability or point of weakness Describes someone's insistence on being paid, even if repayment will destroy the debtor payment received for an act of treachery Something that cannot be interfered with or harmed in any way refers to a great, tumultuous, and passionate uproar that is actually unimportant or meaningless A person who is secluded or protected from the real world and thus out of touch with reality Any extremely complex problem To issue a stern warning that if unacceptable behavior does not cease, severe consequences will follow. Something that happens rarely Anything that tempts someone away from safety and towards a dangerous path To show false sympathy to offer something precious to someone who are unable to appreciate the value of what is given