The "Sub-" Prefix: Beneath, Below, and Secondary

The Latin prefix "sub-" (under, below, beneath) creates words about physical position below and metaphorical subordination or secondary status.

Physical Position

Submarine, subterranean, subway—literally under or below the surface.

Secondary Status

Subordinate, subsidiary, subcommittee—lower in rank or importance.

Hidden or Subtle

Subtle, subtext, subliminal—beneath the surface, not immediately obvious.

Conclusion

Sub- vocabulary reveals how "below" extends metaphorically from physical position to rank, importance, and visibility.