Sentence:  And employing the innate gift for mimicry he'd always had – a gift which had made his father roar with laughter even when he was tired and feeling down – Jack 'did' Morgan Sloat. Age fell into his face as he <WSD>laddered</WSD> his brow the way Uncle Morgan's brow <WSD>laddered</WSD> into lines when he was pissed off about something. 
Meaning of the word marked with <WSD> tags:  To arrange or form into a shape of a ladder.