couple to

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couple (something) (on) to (something)

To connect or fasten two things together. We still need to couple the trailer to the truck before we can leave. I coupled the latch on to the peg, so it should stay secure.
See also: couple

couple something (on)to something

 and couple something on (to something); couple something on
to attach something to something. Couple this connector to that one. The railroad worker coupled on the next car in line. Couple the green one onto the red one.
See also: couple