Proto-Austric: *ʔrVt
Meaning: tie, tight
Austroasiatic meaning: to tie
Proto-Austronesian: *heRet, *qeRut (cf. also [*t'i[ḷ]at] tie knot on)
Austronesian meaning: tight, firm, of a binding
Proto-Thai: ZhT *rat to fasten tightly, tighten
References: Ben 233, Peiros 1998, 81.