My great uncle Frank would say “embarst.” Also “warsht.”
“When it pourt rain on Satidee, we all went out and warsht our heads, but we wernt embarst cause everone does it.”
My older relatives would’ve sounded it out slightly little differently, “Saturday” would be more like “Sahdee,” “washed” would be “wawsht,” “weren’t” would be “won’t” and “everyone” would be “evahbody.” But, they’d still have “embarst.” Kind of a hybrid mishmash of Scotch-Irish twang and English planter drawl. Stands to reason with the geography, I guess, they bordered upon both. It all goes back to settlement patterns.