What is the meaning of Sub-?

Under, beneath.

Subsidiary, secondary.

Almost, nearly.

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under, sub-

Attached to verbs:

1. denotes position: underneath

   denotes position: underneath

   denotes movement:

   1. : from underneath

      : from underneath

      : towards the underside of something, or lower part thereof, (to) underneath; denotes regular allative movement: towards, to

      :

      1. secretively, privily or stealthily; evilly, wickedly, falsely, cunningly or with bad intents

         secretively, privily or stealthily; evilly, wickedly, falsely, cunningly or with bad intents

         denotes sufferance, coping, or brooking

         denotes proping, supporting; denotes helping

         lowers the intensity of the corresponding verb: a little, somewhat, vaguely

         denotes substitution

         denotes sufficiency

         In compounds, may stand for sub in a prepositional phrase

         Attached to adjectives, creates new adjectives of lesser intensity, having a sense like "somewhat", "slightly", "rather", "-ish"

         sub- (under, beneath)

         sub- (subsidiary, secondary)

         sub- (almost, nearly)

         sub- (under, beneath)

         sub- (subsidiary, secondary)

         sub-

         sub-

         Source: wiktionary.org