What is the meaning of Sub-?

Under, beneath.

Subsidiary, secondary.

Almost, nearly.

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under, sub-

1. Attached to verbs, may denote the position or direction of an action

   Attached to verbs, may denote the position or direction of an action

   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