Might couldn't.
source:
LAGS
Entry:
313
Example:
Might couldn't.
Modal 1:
might
Modal 2:
couldn't
Gender:
Female
Race/Ethnicity:
White
Age:
62
Level of Education:
5th grade
Home Community, Town, or State:
GA (6 miles from Milledgeville)
Location Collected:
GA (Milledgeville)
Year:
1970
Relation to Addressee:
subject to fieldworker
Medium:
Spoken
Sentence Structure:
unknown
Status:
Naturalistic