unbonnet means to remove a bonnet from. Lexicurio rates it Sui generis — a strength score of 87 out of 100.
Etymology
From un- + bonnet.
verb
- To remove a bonnet from.“Jacob received them with much gallantry, uncloaking and unbonnetting the ladies, assisted by his two staring and awkward auxiliaries, welcoming their husbands and fathers, and apologizing, as best he might, for the absence of his helpmate;”
- To take off one's bonnet.“He cast his penetrating glance around, and then unbonneting to the Duke, he said respectfully, […]”