Your search for the postposition -t’ah in a recess, pocket or enclosed space, undercover has returned 2 entries

-t’ah

in a recess, pocket or enclosed space, undercover

’Awéé’ bimá bit’ah sitį́.

baby 3-mother 3-undercover 3-lying.SPN
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The baby is lying under the same covers with its mother. (YM 1987g:33)