underside
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underside
The lower surface or side of an object that faces the ground or a base.
Die Unterseite des Teppichs ist mit einer rutschfesten Gummischicht versehen.
The underside of the carpet is fitted with a non-slip rubber layer.
The word is built very logically and is made up of 'unter' (under) and 'Seite' (side). So it literally describes the side that is underneath.
Bitte schreib deinen Namen auf die Unterseite des Blattes.
Please write your name on the underside of the sheet.
To describe a position, the preposition 'an' or 'auf' is usually used with the dative. So you say 'an der Unterseite' (on/at the underside) or 'auf der Unterseite' (on the underside).
An der Unterseite des Geräts befindet sich die Seriennummer.
The serial number is located on the underside of the device.
To say what the underside belongs to, you use the genitive or the preposition 'von' (of/from). For example, 'die Unterseite des Tisches' (the underside of the table) or 'die Unterseite vom Tisch' (the underside of the table).
Die Unterseite des Pilzes war schon ganz braun.
The underside of the mushroom was already completely brown.
inside
'die Unterseite' and 'die Innenseite' both describe a specific side or surface of an object. 'Unterseite' means the surface underneath, that is, the side that often faces the ground. 'Innenseite' means the surface on the inside, for example in a bag, jacket, or box. The words can be confused because a surface can sometimes be both underneath and inside at the same time. The key is the perspective: if it is about top and bottom, 'Unterseite' fits. If it is about inside and outside, 'Innenseite' fits.
Auf der Unterseite des Tisches klebt noch ein altes Preisschild.
There is still an old price tag stuck to the underside of the table.
Ich schreibe meinen Namen auf die Innenseite der Jacke.
I write my name on the inside of the jacket.