From under- + restrain. <span class="searchmatch">underrestrain</span> (third-person singular simple present <span class="searchmatch">underrestrains</span>, present participle underrestraining, simple past and past...
<span class="searchmatch">underrestrains</span> third-person singular simple present indicative of <span class="searchmatch">underrestrain</span>...
underrestraining present participle and gerund of <span class="searchmatch">underrestrain</span>...
underrestrained simple past and past participle of <span class="searchmatch">underrestrain</span>...