riskieren
to risk
To do something where there is the possibility of a negative outcome, damage, or loss; to put something at stake.
Wer ohne Ticket fährt, riskiert eine hohe Geldstrafe.
Anyone who rides without a ticket risks a large fine.

to risk
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to risk
To do something where there is the possibility of a negative outcome, damage, or loss; to put something at stake.
Wer ohne Ticket fährt, riskiert eine hohe Geldstrafe.
Anyone who rides without a ticket risks a large fine.

The verb 'riskieren' (to risk) belongs to the noun 'das Risiko' (risk). When you risk something, you 'ein Risiko eingehen' (take a risk).
Er ging ein hohes Risiko ein, als er sein ganzes Geld in diese Aktie investierte.
He took a high risk when he invested all his money in this stock.
'Riskieren' (to risk) is very often used with an infinitive construction with 'zu' (to). This describes which negative outcome is being risked.
Er riskierte, seinen Flug zu verpassen, weil er zu spät losfuhr.
He risked missing his flight because he left too late.
The verb 'riskieren' (to risk) always needs an accusative object. Common objects are negative consequences such as 'eine Niederlage riskieren' (to risk a defeat), 'eine Verletzung riskieren' (to risk an injury), or 'eine Strafe riskieren' (to risk a penalty/fine).
Der Sportler wollte keine schwere Verletzung riskieren und beendete den Wettkampf.
The athlete did not want to risk a serious injury and ended the competition.
The expression 'einen Blick riskieren' (to risk a glance) is very common. It means to look somewhere briefly, cautiously, or secretly.
Sie riskierte einen Blick auf die Uhr, weil der Vortrag so langweilig war.
She risked a glance at the clock because the lecture was so boring.
to set / put
'etwas aufs Spiel setzen' (to put something at risk) and 'riskieren' both mean that you may lose something valuable because you make an uncertain decision. 'riskieren' is the normal verb for many situations involving danger or possible loss. 'etwas aufs Spiel setzen' sounds stronger and emphasizes that a lot is really at stake, for example money, trust, or your own future. In many sentences, both can be understood similarly, but 'aufs Spiel setzen' is especially suitable when the possible loss is important.

Meine Kollegin riskiert eine Verspätung, wenn sie den späteren Zug nimmt.
My colleague risks being late if she takes the later train.
Mit dieser Lüge setzt er das Vertrauen seiner Freunde aufs Spiel.
With this lie, he is putting his friends' trust at risk.