
binden
to tie
To join or fasten something together with a ribbon, string, or something similar.
Sie band die alten Zeitungen zu einem Bündel.
She tied the old newspapers into a bundle.
to tie / bind
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to tie
To join or fasten something together with a ribbon, string, or something similar.
Sie band die alten Zeitungen zu einem Bündel.
She tied the old newspapers into a bundle.

to tie
To knot the laces of shoes into a bow.
Das Kind lernt gerade, seine Schuhe selbst zu binden.
The child is just learning to tie his own shoes.

to commit oneself
To enter into a firm obligation or relationship, especially a partnership or marriage.
Nach vielen Jahren als Single möchte er sich nun fest binden.
After many years of being single, he now wants to commit himself to a serious relationship.

to thicken
To make a liquid, such as a sauce or soup, thicker by adding starch, flour, or another thickening agent.
Um die Soße zu binden, rühre ich etwas Speisestärke in kaltem Wasser an.
To thicken the sauce, I stir some cornstarch into cold water.

to be bound to
To be obligated by a promise, contract, or rule to do something or refrain from doing something.
Wir sind an den Vertrag gebunden und können ihn nicht einfach kündigen.
We are bound to the contract and can't simply terminate it.

to bind
To join the pages of a book together and provide them with a cover.
Der Buchbinder kann Ihre Abschlussarbeit professionell binden.
The bookbinder can bind your thesis professionally.

to bind
In chemistry, the ability of atoms or molecules to exert forces on each other and combine into larger units.
Zwei Wasserstoffatome binden ein Sauerstoffatom und bilden so ein Wassermolekül.
Two hydrogen atoms bind one oxygen atom and thus form a water molecule.
The verb 'binden' (to tie / bind) is the root of many related words. 'Die Bindung' is the noun for the connection or relationship, and 'gebunden' is the participle that is often used as an adjective meaning 'obligated' or 'not free'.
Zwischen Mutter und Kind besteht eine starke Bindung.
There is a strong bond between mother and child.
'Binden' is a strong verb with the vowel change i-a-u. The past forms are 'band' (simple past) and 'hat gebunden' (present perfect).
Sie band sich einen Schal um den Hals.
She tied a scarf around her neck.
The reflexive form 'sich binden' means to enter into a firm commitment, usually emotionally or in a partnership. It describes the decision to limit one's own freedom in favor of a relationship.
Er hat Angst, sich zu früh zu binden.
He is afraid of committing himself too early.
In the context of cooking and recipes, 'binden' means to make a liquid thicker. Signal words for this are 'Soße' (sauce), 'Suppe' (soup), 'Stärke' (starch), or 'Mehl' (flour).
Ich binde die Bratensoße immer mit etwas Mondamin.
I always thicken the gravy with a little Mondamin.
The phrase 'an etwas gebunden sein' expresses an obligation. The preposition 'an' is used here with the accusative.
Ich würde gerne mitkommen, aber ich bin an eine frühere Zusage gebunden.
I would like to come along, but I am bound by an earlier commitment.
In the literal meaning, 'binden' is often used for joining things together. Typical examples are 'einen Blumenstrauß binden' (to tie/arrange a bouquet), 'einen Kranz binden' (to make/tie a wreath), or 'ein Buch binden' (to bind a book).
Zu Weihnachten binden wir jedes Jahr einen Adventskranz.
Every year at Christmas, we make an Advent wreath.
When 'Bücher' (books), 'Seiten' (pages), or an 'Arbeit' (paper/thesis, e.g. bachelor's thesis) are mentioned, 'binden' refers to the craft process of joining loose sheets into a fixed book.
Ich lasse meine Masterarbeit professionell binden.
I'm having my master's thesis professionally bound.
to oblige / commit
In the context of a contract, verpflichten can emphasize the conclusion of the contract or the imposition of a contractual task from the perspective of a person or organization. Binden, by contrast, highlights that someone is bound to an obligation by the contract. Both words can fit the same context, but they place the emphasis differently.

Der Vertrag bindet den Stürmer für drei Jahre an den Verein.
The contract binds the striker to the club for three years.
Der Verein verpflichtete den Stürmer für drei Jahre.
The club signed the striker for three years.