Idioms in English and their equivalent in Spanish.

• Add Fuel To The Fire:  Whenever something is done to make a bad situation even worse than it is. echar leña al fuego

• Against The Clock:  Rushed and short on time.  contra reloj

• Cross Your Fingers: To hope that something happens the way you want it to. cruzar los dedos

• Don't Look A Gift Horse In The Mouth: When someone gives you a gift, don't be ungrateful.  a caballo regalado no se le miran los dientes

• Flea Market: A swap meet. A place where people gather to buy and sell inexpensive goods. mercado de pulgas

• French Kiss: An open mouth kiss where tongues touch. beso francés

• Good Samaritan: Someone who helps others when they are in need, with no discussion for compensation, and no thought of a reward.  buen samaritano

• Hocus Pocus: In general, a term used in magic or trickery.  abracadabra

• It's A Small World: You frequently see the same people in different places. el mundo es chico.

• The Last Straw: When one small burden after another creates an unbearable situation, the last straw is the last small burden that one can take. la gota que colmó el vaso con agua.