put the seal on

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put the seal on (something)

To definitively confirm, finalize, or conclude (something). Her victory tonight puts the seal on the runner's remarkable unbeaten career. Many are hopeful that the meeting will finally put the seal on a peace agreement between the two warring nations.
See also: on, put, seal

put (or set) the seal on

put the finishing touch to.
See also: on, put, seal