put (or set) the seal on put the finishing touch to.
seal of approval: seeapproval.
seal someone's fate: seefate.
set (or put) your seal to (or on) mark with your own distinctive character.
☞ The reference in both of these idioms is to the former practice of stamping your personal seal on a completed letter or other document.
signed, sealed, and delivered: seesign.
someone's lips are sealed: seelip.
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