Definition of tightlock
(Entry 1 of 2)
: of, relating to, or being a coupling device for cushioning the impact between railroad cars at starts or stops by taking up the slack
Definition of tight lock (Entry 2 of 2)
: a disease of cotton caused by any of several fungi (especially of the genus Diplodia) and characterized by failure of the affected locks to fluff and by discoloration and weakening of the fibers
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