Past Tense of “bind”
The past tense of bind is bound; the past participle is bound.
Why “bind” behaves this way
"Bind" descends from Old English "bindan," a strong verb belonging to the same ablaut class as "find" and "grind" (bindan/band/bunden), which is why all three still share a visibly similar vowel-shift pattern today. The noun "band" (as in a rubber band, or a musical group) and "bond" (a legal or emotional tie) both derive directly from this same root, fossilizing different historical vowel grades of the verb's own conjugation into separate nouns.
"Band" and "bond" being frozen forms of "bind"'s own past-tense vowel grades is a clear example of how English nouns sometimes derive directly from a verb's conjugation rather than from a separate word entirely — a musical "band" is etymologically something that binds its members together, and a legal "bond" is something that binds two parties to an agreement, both senses tracing straight back to this one Old English strong verb.
The common confusion
Nobody trips over "bound" itself; the real mix-up is the unrelated adjective "bound" meaning "headed toward" ("homeward bound"), which comes from an entirely different word, the Old Norse "buinn" (ready, prepared), and is a coincidental homograph rather than a genuine second sense of this verb's past participle.
How it's actually used
"Bind" extends into legal and emotional senses far beyond literal physical tying — a contract "binds" two parties, a shared experience "binds" people together — all figurative extensions of the core idea of connecting things firmly. "Bookbinding" preserves the verb's most literal ancient sense, the physical craft of securing pages together into a cover, a trade term that has changed little in meaning since Old English. Chemistry and biology use "bind" as precise technical vocabulary describing molecules attaching to one another ("the protein binds to the receptor"), a modern scientific sense with no connection to physically tying an object. "In a bind" is a common idiom describing being stuck in a difficult situation, extending the literal sense of being physically tied up into a metaphor for being constrained by circumstances.
Across the tense system
"Bound" functions as an independent adjective in several distinct senses — legally "bound" (obligated), physically "bound" (tied up), and the unrelated directional "bound" (headed toward) — three meanings that a reader must distinguish entirely by context, since all three share identical spelling despite two having genuinely separate historical origins. "Binding arbitration," a specific legal process whose outcome both parties must accept without further appeal, is a fixed compound noun phrase built directly on this verb's sense of an unbreakable obligation, distinct from non-binding negotiation or mediation.
Common real mistakes
A frequent error among learners is conflating the two unrelated senses of "bound" — assuming "homeward bound" and "legally bound" share a common origin, when only the legal/physical sense actually derives from "bind." A separate, rarer mistake is producing "binded" as a regularized past tense, an error uncommon among fluent speakers but occasionally seen in early learner writing. Learners can also conflate legally "binding" (an agreement that must be honored) with merely "agreed" or "informal," since only the former carries actual enforceable weight in a contract or court of law. A further subtlety: "binding" as an adjective describing a legal agreement should not be confused with "bookbinding," the craft sense discussed above, since context alone tells a reader which specialized meaning of the word is intended in a given sentence.
Examples
- She bound the wound tightly with a clean cloth.
- They have bound themselves to the contract for five years.
- He bound the stack of papers with a length of twine.
- We had bound the two documents together before filing them.
- Duty binds her to stay until the project is finished.
- The two families are bound by a long shared history.
- She's binding the book by hand, page by page.
- The travelers were bound for the coast by nightfall. (unrelated homograph)
Memory trick
Group "bind/bound/bound" with "find/found/found" and "grind/ground/ground" as sharing the same ancient ablaut pattern, and keep the unrelated adjective "bound" (headed toward, as in "homeward bound") filed separately, since it comes from a completely different root.