Excellent for laying to rest those niggling doubts.
"Rest" seems to be used figuratively, context leading me to interpret it as clear up[dispel, resolve]. Was I correct?
Merriam Webster dictionary just says:
https://www.merriam-webster.com/dictionary/transitive
1: to give rest to2: to set at rest3: to place on or against a support4: to cause to be firmly fixed // rested all hope in his child5: to desist voluntarily from presenting evidence pertinent to (a case at law)clear up[dispel, resolve]. Was I correct? Yes
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"Lay (someone) to rest"is an expression meaning to bury their body after they are dead. Those niggling doubts are dead and buried.