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coupling [couplings]▼(act of joining together to form a couple)noun[UK: ˈkʌp.l̩.ɪŋ] [US: ˈkʌp.l̩.ɪŋ]
shackle [shackles]▼(link for connecting railroad cars)noun[UK: ˈʃæk.l̩] [US: ˈʃæk.l̩]
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