trump
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asset / trump card
An advantage or means that you use at the right moment to prevail over others or achieve a goal.
Ihr größter Trumpf in der Verhandlung war eine Information, die sonst niemand hatte.
Her greatest asset in the negotiation was a piece of information that no one else had.
The general meaning 'Vorteil' (advantage) is a metaphor from card games. Just as a trump card beats other cards in the game, a 'Trumpf' (trump card/asset) in a figurative sense can be a decisive advantage in a discussion or negotiation.
Sein Wissen über das Thema war sein größter Trumpf in der Debatte.
His knowledge of the topic was his greatest asset in the debate.
In the figurative sense, 'Trumpf' is often combined with verbs like 'ausspielen' (to play/use), 'haben' (to have), or 'sein' (to be). Typical expressions are 'einen Trumpf in der Hand haben' (to have a trump card up one's sleeve) or 'seinen letzten Trumpf ausspielen' (to play one's last trump card).
Für die Gehaltsverhandlung hatte sie noch einen Trumpf in der Hand.
For the salary negotiation, she still had a trump card up her sleeve.
In the context of card games, the structure '[Farbe] ist Trumpf' ([suit] is trump) is often used to determine the trump suit. You can also ask: 'Was ist Trumpf?' (What is trump?).
Bei diesem Stich ist Kreuz Trumpf.
In this trick, clubs are trump.
color / paint
'Farbe' and 'Trumpf' can both be important in card games, but they do not mean the same thing. 'Farbe' is a suit, for example hearts, diamonds, spades, or clubs. 'Trumpf' is the card or suit that is stronger than the others in a game and can beat them. The words can easily be confused because a trump is often also a particular suit. But not every suit is trump. The rules of the game decide which suit is trump.
Omar spielt seinen letzten Trumpf und gewinnt die Runde.
Omar plays his last trump and wins the round.
Beim Kartenspiel muss Max eine Karte derselben Farbe legen.
In the card game, Max has to play a card of the same suit.