A substandard job is one that is below par or below the standard expected. Sub means below. Sub is the prefix.
The prefix sub- means under. One common word with this prefix is submarine.
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Sub means under. Such as submarine means under the water. And sub-category would mean a smaller division of the main cetegory, i.e. Blood Pressure would be a sub-category of Health.
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submarine
The prefix sub- means under. In this word it roughly means the under way.
Submarine, submersible, subterfuge, subdivide, subheading, subordinate
The definition of the prefix sub is: Under or less than.
The prefix sub- means under. One common word with this prefix is submarine.
the prefix is sub-
the prefix is (sub)
One prefix for the word above would be "supra-" Example, Suprarenal, which means "above the kidneys"
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Some words with the prefix sub are: Submarine, Subterranean, Subtext, Subtract, Submerge.