Try shooting some WD-40 lubricant into the 'chuck' and let it sit for awhile, then rotate the outer part of the chuck CCW to loosen the 'jaws'. If the chuck is a keyless type, just hold the chuck and turn the reversing switch to 'reverse', then gently apply power to the trigger--that should open the chuck jaws. You will likely find that a leather glove on the hand holding the chuck will help prevent a burned hand if you lose your grip. If it is a keyed--type chuck (there will be ring of gear teeth on the front edge of the chuck), then a key with a small gear near one end is required to turn the chuck open (turn the key CCW). Hope this helps!
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