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Part of speech:

A prefix signifying " under" or " below"; beneath; sub denotes a less or inferior degree, or an imperfect state, of the quality expressed by the word before which it is placed; for the sake of euphony, the b in sub becomes c, f, g, m, p, or s, according to the first letter of the other part of the word, as in succeed, suffer, suggest, summon, supplant, sustain.

Part of speech: Noun

In familiar language, a subordinate; one lower in rank.

Usage examples "sub":