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