תַּחֲרָאtachărâʼ

probably (linen) corselet (Exodus 28:32; Exodus 39:23)

Pronunciation: takh-ar-aw' · Hebrew/Aramaic (Old Testament) · H8473

Same root

חָרָהchârâh · H2734to glow or grow warm; figuratively (usually) to blaze up, of anger, zeal, jealousy
חוּרchûwr · H2352the crevice of a serpent; the cell of aprison
חוּרchûwr · H2353white linen

Where it appears

Appears 2 times in the Bible.

Exodus 28:32 with an opening for Aaron’s head in the middle of it. Reinforce the opening with a woven collar so it will not tear.
Exodus 39:23 with an opening for Aaron’s head in the middle of it. The opening was reinforced with a woven collar so it would not tear.

Source: Brown, Driver and Briggs, Hebrew and English Lexicon of the Old Testament (1906), public domain; markup by unfoldingWord, CC BY (github.com/unfoldingWord/Brown-Driver-Briggs-Enhanced).