For some reason I thought I’d look into the word trump today. It has a number of meanings:

1. trump (noun): the suit, in a game of cards, that outranks all others; a playing card of that suit; something that gives one an advantage, especially one held in reserve.

Etymology
From triumph, from the French triomphe ‎(triumph), from the Latin triumphus (triumph, victory), via the Etruscan triumpus from the Ancient Greek θρίαμβος ‎(thríambos – a hymn to Dionysos).

2. trump (verb): to fabricate, devise.

Etymology
From trump (to deceive, cheat), from the Middle English trumpen, from the Old French tromper (to deceive). Of uncertain origin. Perhaps from the practise of quacks and mountebanks using a trumpet or horn to attract the public, who were then cheated into buying things.

Related French expressions:
– tromper = to deceive, lead astray, mislead; to trick, dupe; to cheat on one’s significant other; to distract oneself from.
– se tromper = to make a mistake
– se tromper de = to mix up
– baillier la trompe = to blow the trumpet, act the fool

The expression trumped up (false, concocted) was first recorded 1728.

3. trump (noun): a trumpet; flatulence; the noise made by an elephant through its trunk.

Etymology
From the Middle English trompe ‎(trumpet), from the Old French trompe‎ (horn, trump, trumpet) from the Frankish *trumpa/*trumba ‎(trumpet).

Sources: Online Etymology Dictionary and Wiktionary