Quenya 

uswë

issue, escape

uswë noun "issue, escape" (LT1:251)

uswë

noun. escape, issue, outlet

us-

verb. escape

#us- vb. "escape" (given in the form usin "he escapes" in LT1:251; this would have to mean "I escape" if the word is to be adopted to Tolkien's later Quenya). Cf. uswë.