Definition of "thack" []

• To strike; thump; thwack. (verb)
• A stroke; a thwack. (noun)
• The weatherproof outer layer of a roof, often thatch specifically (noun)
• To cover a roof with thack. (verb)

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• "Tree, shed, barn, and chimney-stack, too, seemed to have been turned to the brilliant metal; but to the lad's great relief he saw that the wheelwright was wrong, the "thack" had not caught, and so far the house was safe, though the burning stacks were so near that at any moment the roof of the reed-thatched house might begin to blaze."
• "Somebody please investigate all of OBama's friends and acquaintances before it's too late. thack"
• "It swung gently, thumping against the freezer door with a small thack sound."