unstrain

from WordNet (r) 3.0 (2006)

unstrain
    v 1: cause to feel relaxed; "A hot bath always relaxes me" [syn:
         {relax}, {unstrain}, {unlax}, {loosen up}, {unwind}, {make
         relaxed}] [ant: {strain}, {tense}, {tense up}]

from The Collaborative International Dictionary of English v.0.48

Unstrain \Un*strain"\, v. t. [1st pref. un- + strain.]
   To relieve from a strain; to relax. --B. Jonson.
   [1913 Webster]

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