sopite
To put to sleep, or to quieten.
obsolete, transitive
... Balmawhapple could not, by the code of honour, evite giving satisfaction to ... Edward by such a palinode as rendered the use of the sword unnecessary, and which, being made and accepted, must necessarily sopite the whole affair.
Where it comes from
From Latin sopitus, past participle of sopire (“to put to sleep”).
Adapted from the Wiktionary entry sopite (CC BY-SA 4.0).