No definitions found for 'dead certainty'
Perhaps one of these:
dutes auriga,
ditcher,
dyadic arithmetic,
dutch rush,
dedecorate,
diatessaron,
death grip,
dutch harbor,
dutch iris,
death's-herb,
death chair,
dodgery,
dedecoration,
data service unit,
dodger,
datagram,
death square,
dead ground,
dowitcher,
dedecorous,
death grapple,
ditch reed