Your search for the postposition -chá-, -chá bunched up, bunched together, huddled has returned 3 entries

-chá- or -chá

Béégashii yáázh bichá ninish’aah.

calf 3-bunch 3-1-put.I.SRO

Shichá si’ą́ągo ’iiłhaazh.

1-huddle 3-put-SPN-GO 1-sleep.P
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I went to sleep huddled up into a ball. (YM 1987g:29)