theirself

Related to theirself: Themself

their·selves

T0147450 (thâr-sĕlvz′) also their·self (-sĕlf′)pron. Chiefly Southern & South Midland US Themselves. See Note at hisself.

theirself

(ðɛəˈsɛlf) pron a dialect form of themselves