der Finger
finger
One of the movable parts at the end of a human hand.
Ich habe mich beim Kochen in den Finger geschnitten.
I cut my finger while cooking.

finger
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finger
One of the movable parts at the end of a human hand.
Ich habe mich beim Kochen in den Finger geschnitten.
I cut my finger while cooking.

'Finger' (finger) is the basis for many useful words. These include body parts like 'Zeigefinger' (index finger) or 'Fingerspitze' (fingertip), but also abstract terms like 'Fingerspitzengefühl' (intuition/tact).
Für diese heikle Aufgabe braucht man viel Fingerspitzengefühl.
For this delicate task, you need a lot of tact.
In the literal sense, 'Finger' (finger) is often combined with certain verbs. Typical phrases are 'mit dem Finger auf jemanden zeigen' (to point at someone with one's finger), 'sich in den Finger schneiden' (to cut one's finger), or 'sich die Finger verbrennen' (to burn one's fingers).
Es ist unhöflich, mit dem Finger auf andere Leute zu zeigen.
It's impolite to point at other people with your finger.
The idiom 'keinen Finger krumm machen' (not to lift a finger) is grammatically fixed. The verb is 'krumm machen' and it is almost always used in this negated form to express inactivity.
Er hat den ganzen Tag nur auf dem Sofa gelegen und keinen Finger krumm gemacht.
He just lay on the sofa all day and didn't lift a finger.
In the expression 'jemanden um den Finger wickeln' (to wrap someone around one's finger), the person being manipulated is always in the accusative. The person doing the action is the subject of the sentence.
Der kleine Junge kann seine Großmutter mit einem Lächeln um den Finger wickeln.
The little boy can wrap his grandmother around his finger with a smile.
The idiom 'sich etwas aus den Fingern saugen' (to make something up) is reflexive. The person inventing something often appears with a dative reflexive pronoun: 'Ich sauge mir eine Ausrede aus den Fingern.' (I'm making up an excuse.)
Die Journalistin hat sich die Fakten für ihren Artikel nicht nur aus den Fingern gesogen.
The journalist didn't just make up the facts for her article.
thumb
'der Finger' and 'der Daumen' both belong to the hand. The difference is: 'Finger' usually means one of the movable parts of the hand, not including the thumb, for example the index finger or middle finger. 'Der Daumen' is the short, strong finger on the side of the hand. In a general sense, you can also see the thumb as a finger, but in everyday language it is almost always called 'Daumen' separately. Learners may confuse the words because the thumb anatomically belongs to the hand like the fingers. If you want to be precise, use 'Daumen' for this part of the hand.

Beim Schneiden habe ich mir in den Finger geschnitten.
I cut my finger while chopping.
Max hebt den Daumen, weil ihm die Idee gefällt.
Max gives a thumbs-up because he likes the idea.