"underexpanded" meaning in English

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  "etymology_text": "From under- + expanded.",
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  "lang_code": "en",
  "pos": "adj",
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          "text": "The setup makes use of LEDs, pulsed with high currents to increase the optical output to sufficient levels, exploiting the advantages of LED light over conventional light sources. As a test-case we study the interaction of a Mach 1.7 cross flow and a transverse underexpanded jet, which is commonly studied considering the mixing and combustion in scramjet engines.",
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        "Less than usually expanded"
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  "etymology_text": "From under- + expanded.",
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          "text": "The setup makes use of LEDs, pulsed with high currents to increase the optical output to sufficient levels, exploiting the advantages of LED light over conventional light sources. As a test-case we study the interaction of a Mach 1.7 cross flow and a transverse underexpanded jet, which is commonly studied considering the mixing and combustion in scramjet engines.",
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        "Less than usually expanded"
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