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• v  manage in a makeshift way; do with whatever is at hand
• v  perform without preparation
  he extemporized a speech at the wedding

• The President's move was so unexpected that Democrat Harrison was forced to extemporize a trifle uncertainly.
• At that point Rommel was worsted and he began to extemporize.
• Prior to his high tea at Cliveden, Motor Man Ford sojourned idly in London, delaying his projected tour of the British Isles, but found time to extemporize to the press as follows:.

• improvise
• improvize
• ad-lib
• extemporise