Aufbinden vs. lösen
In German, both aufbinden and lösen can translate to the English phrase to untie, but they focus on different aspects of the action. The word aufbinden is specifically about reversing the deliberate action of tying strings, ribbons, or laces, whereas lösen describes the broader act of loosening, untangling, or releasing a tight connection or stubborn knot.
Aufbinden
The word aufbinden is used when you undo a physical knot, bow, or lace that was previously tied together on purpose. It is the direct opposite of tying and is most commonly used for everyday items involving strings or ribbons, such as shoelaces, aprons, or gift wrapping.
Kannst du mir bitte die Schuhe aufbinden?
(Can you please untie my shoes for me?)
Der Koch muss seine Schürze aufbinden, bevor er das Restaurant verlässt.
(The chef has to untie his apron before leaving the restaurant.)
Sie versuchte ungeduldig, das rote Band des Geschenks aufzubinden.
(She impatiently tried to untie the red ribbon of the present.)
Das kleine Kind kann sich die Schnürsenkel noch nicht alleine aufbinden.
(The little child cannot untie their shoelaces alone yet.)
Du musst den Sack aufbinden, um an die Kartoffeln zu kommen.
(You have to untie the sack to get to the potatoes.)
Lösen
The word lösen generally translates to loosen, release, or solve. When applied to knots, ropes, or ties, it implies carefully undoing a tight, stubborn, or complex knot. It places focus on the act of freeing something, releasing tension, or untangling a mess, rather than just undoing a simple bow.
Dieser Knoten ist so fest, dass ich ihn kaum lösen kann.
(This knot is so tight that I can hardly untie it.)
Der Feuerwehrmann musste die Seile rasch lösen, um die Ausrüstung zu befreien.
(The firefighter had to untie the ropes quickly to free the equipment.)
Mit kalten und nassen Fingern ist es schwer, die dicken Schnürsenkel zu lösen.
(With cold and wet fingers, it is hard to untie the thick shoelaces.)
Der Zauberer bat jemanden aus dem Publikum, seine Fesseln zu lösen.
(The magician asked someone from the audience to untie his restraints.)
Versuche vorsichtig, das verhedderte Garn zu lösen, ohne es zu zerreißen.
(Try carefully to untangle the twisted yarn without tearing it.)
Summary
In short, choose aufbinden when you are dealing with everyday strings and laces meant to be tied and untied, such as on shoes or aprons. Opt for lösen when you are confronted with a very tight, stuck, or difficult knot that requires physical effort to loosen and release.