削

verb: to pare (with a knife), to peel, to slice
削

削 has many reading- and dialect-specific senses (Mandarin xuē/xiāo, Cantonese, Hokkien, sports jargon); the general 'to pare/peel/slice' sense was chosen as the most universal match for siah4, but the page does not confirm exactly which sense set attaches to this Teochew reading.