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Spin$-$orbit alignment (SOA; i.e., the vector alignment between the halo spinand the orbital angular momentum of neighboring halos) provides an importantclue to how galactic angular momenta develop. For this study, we extractvirial-radius-wise contact halo pairs with mass ratios between 1/10 and 10 froma set of cosmological $N$-body simulations. In the spin--orbit angledistribution, we find a significant SOA in that 52.7%$\pm$0.2% of neighbors areon the prograde orbit. The SOA of our sample is mainly driven by low-masstarget halos ($<10^{11.5}h^{-1}M_{\odot}$) with close merging neighbors,corroborating the notion that the tidal interaction is one of the physicalorigins of SOA. We also examine the correlation of SOA with the adjacentfilament and find that halos closer to the filament show stronger SOA. Mostinterestingly, we discover for the first time that halos with the spin parallelto the filament experience most frequently the prograde-polar interaction(i.e., fairly perpendicular but still prograde interaction; spin--orbit angle$\sim$ 70$^{\circ}$). This instantly invokes the spin-flip event and theprograde-polar interaction will soon flip the spin of the halo to align it withthe neighbor's orbital angular momentum. We propose that the SOA originatesfrom the local cosmic flow along the anisotropic large-scale structure,especially that along the filament, and grows further by interactions withneighbors.

Living with Neighbors. IV. Dissecting the Spin$-$Orbit Alignment of Dark Matter Halos: Interacting Neighbors and the Local Large-scale Structure