To take a plunge

Avioncito: A dragon fly. The correct word is libélula
Chotear: To make fun of someone: Burlarse de is the correct Spanish verb.
Chupaplatos: One’s index finger or dedo índice actually means index finger.
Clete or bici: Bicycle or bike. The correct Spanish word is bicicleta.
Cortarle el rabo a alguien: To fire someone from a job. Despedir is more correct.
Cuadrar: To like. A José le cuadra la música. Joe likes music.
El Monstruo: The nickname of Costa Rica’s Saprrisa soccer team.
Estar con toda la pata: To be in good health
Gato: A person with blue eyes.
Techo or torre: Roof or someone’s head
Guato: A dog. Zaguate, peludo and gua gua are also used for dog here.
Tirarse al agua: To take the plunge (figurative)
Tener a pura té de tilo: To be nervous. Estar nervioso is also used.
Tener guaro vaquero: To be a mean drunken person
¡Zapatero a sus zapatos!: Get to work! ¡Manos a la obra! means the same.

Agarrarle a alguien con las manos en la masa: To be caught red handed
Ha pasado mucha agua debajo de ese molino: Water over the dam or bridge or something that is over and done with,
Regarse las bilis: To get mad. Enojarse and ponerse bravo/a are more correct terms.
Irse de jupa: To fall head first. Jupa means ‘head’ in Costa Rican slang. Irse de espaldas or irse de trasero is to fall backwards.

Costa Rica Spanish – Guide to learn Spanish