The phrase "are bound to each" is not correct in standard written English as it lacks clarity and context.
It could be used in a context discussing relationships or connections between entities, but it needs additional words for clarity.
Example: "The two teams are bound to each other by a common goal."
Alternatives: "are connected to each other" or "are linked to one another."
We are bound to each other, as are all Americans.
They are bound to each other and the Ford brand.
Henceforward, the two are bound to each other by an imperishable love that dares all dangers and makes light of hardships but does not destroy their loyalty to the king.
When atoms chemically combine, the energy necessary to separate them is called the bond energy, and the measure of this energy determines how tightly the two atoms are bound to each other.
Among Veronese's last works were superb allegorical fables, such as a series for Rudolph II that included The Choice of Hercules and Allegory of Wisdom and Strength; and Mars and Venus United by Love, in which the figures are bound to each other by harmonious rhythms.
MIR and FIR spectra indicate that, four phosphinoyl arms of the calixarene and two monodentate nitrates are bound to each 6-coordinate uranyl ion in the complex because no vibrational frequencies from un-coordinated OP groups or from ionic nitrates are present; in addition the spectra reveal that water molecules form intramolecular hydrogen bonding with monodentate nitrates.
Some of the prisoners, the still unbroken ones, were bound, and some were bound to each other, lest they jump from the trucks.
He was placed in "stress positions": his elbows and ankles were bound to each other behind his back as he faced downward, resulting in a pain so consuming that he could barely breathe.
Geoprocessing services or GRASS components have been bound to each geoprocessing nodes listed in hierarchical trees of the left panel by default.
Engaging in the same pursuits, sharing the same joys and the same sorrows, they were bound to each other by no common feelings of mutual love".
