
die Stirn
forehead
The part of the face located above the eyebrows and below the hairline.
Er wischte sich mit dem Handrücken den Schweiß von der Stirn.
He wiped the sweat from his forehead with the back of his hand.
forehead
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forehead
The part of the face located above the eyebrows and below the hairline.
Er wischte sich mit dem Handrücken den Schweiß von der Stirn.
He wiped the sweat from his forehead with the back of his hand.

to stand up to
To confront someone or something bravely and decisively; to offer resistance.
Die kleine Firma konnte der übermächtigen Konkurrenz lange die Stirn bieten.
The small company was able to stand up to the overpowering competition for a long time.

to furrow one's brow
To wrinkle the skin on the forehead, usually as an expression of thought, concentration, skepticism, or displeasure.
Der Professor runzelte die Stirn, als er die ungewöhnliche Frage hörte.
The professor furrowed his brow when he heard the unusual question.
The idiom 'jemandem/etwas die Stirn bieten' (to stand up to someone/something) is a fixed construction. The person or thing being resisted is always in the dative.
Sie hat ihrem Chef mutig die Stirn geboten.
She bravely stood up to her boss.
'Die Stirn runzeln' (to furrow one's brow) is a fixed combination of the verb 'runzeln' (to wrinkle/furrow) and the accusative object 'die Stirn' (the forehead). It expresses thought, skepticism, or concern.
Er runzelte die Stirn und las die E-Mail noch einmal.
He furrowed his brow and read the email again.
In its literal meaning, 'Stirn' is often combined with actions. Typical phrases are 'sich den Schweiß von der Stirn wischen' (to wipe the sweat from one's forehead) or 'die Stirn in Falten legen' (to wrinkle/furrow one's brow).
Nach dem langen Lauf wischte er sich den Schweiß von der Stirn.
After the long run, he wiped the sweat from his forehead.