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noun
1.
a submarine.
2.
a substitute.
3.
a submarine sandwich. See hero sandwich.
4.
a subcontractor.
5.
a sublieutenant.
6.
a subordinate.
7.
a subaltern.
8.
British. an advance against one’s wages, especially one granted as a subsistence allowance.
9.
Photography. a substratum.
verb (used without object), subbed, subbing.
10.
to act as a substitute for another.
verb (used with object), subbed, subbing.
11.
Photography. to coat (a film or plate) with a substratum.
1.
supplemental unemployment benefits.
1.
a prefix occurring originally in loanwords from Latin (subject; subtract; subvert; subsidy); on this model, freely attached to elements of any origin and used with the meaning “under,” “below,” “beneath” (subalpine; substratum), “slightly,” “imperfectly,” “nearly” (subcolumnar; subtropical), “secondary,” “subordinate” (subcommittee; subplot).
2.
Chemistry.

a prefix indicating a basic compound:
subacetate; subcarbonate; subnitrate.
a prefix indicating that the element is present in a relatively small proportion, i.e., in a low oxidation state:
subchloride; suboxide.

1.
subordinated.
2.
subscription.
3.
substitute.
4.
suburb.
5.
suburban.
6.
subway.
noun
1.
short for several words beginning with sub- See subaltern, subeditor, submarine, subordinate, subscription, substandard, substitute, substratum (sense 6)
2.
(Brit, informal) an advance payment of wages or salary Formal term subsistence allowance
verb subs, subbing, subbed
3.
(intransitive) to serve as a substitute
4.
(intransitive) (informal) to act as a substitute (for)
5.
(Brit, informal) to grant or receive (an advance payment of wages or salary)
6.
(transitive) (informal) short for subedit
7.
(transitive) (photog) to apply a substratum to (a film or plate base)
prefix
1.
situated under or beneath: subterranean
2.
secondary in rank; subordinate: subeditor
3.
falling short of; less than or imperfectly: subarctic, subhuman
4.
forming a subdivision or subordinate part of a whole: subcommittee
5.
(in chemistry)

indicating that a compound contains a relatively small proportion of a specified element: suboxide
indicating that a salt is basic salt: subacetate

abbreviation
1.
subeditor
2.
subito (in music)
3.
subscription
4.
substitute

sub- pref.

Below; under; beneath: subcutaneous.

Subordinate; secondary: subinfection.

Subdivision: subkingdom.

Less than completely or normally; nearly; almost: subfertility.

sub-
A prefix that means “underneath or lower” (as in subsoil), “a subordinate or secondary part of something else” (as in subphylum.), or “less than completely” (as in subtropical.)
stymie
suave
submarine sandwich

Substitute
sub
1.
submarine
2.
substitute
sub.
1.
subaltern
2.
suburb
3.
suburban