Noun sub has 2 senses
  1. bomber, grinder, hero, hero sandwich, hoagie, hoagy, Cuban sandwich, Italian sandwich, poor boy, sub, submarine, submarine sandwich, torpedo, wedge, zep - a large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States
    --1 is a kind of sandwich
  2. submarine, pigboat, sub, U-boat - a submersible warship usually armed with torpedoes
    --2 is a kind of submersible, submersible warship
    --2 has parts:
     conning tower; escape hatch; periscope; snorkel, schnorkel, schnorchel, snorkel breather, breather; sonar, echo sounder, asdic
    --2 has particulars:
     attack submarine; auxiliary research submarine; fleet ballistic missile submarine; nautilus, nuclear submarine, nuclear-powered submarine
,Verb sub has 1 sense
  1. substitute, sub, stand in, fill in - be a substitute; "The young teacher had to substitute for the sick colleague"; "The skim milk substitutes for cream--we are on a strict diet"
    --1 is one way to exchange, change, interchange
    Derived form: noun subbing1
    Sample sentences:
    Somebody ----s
    Somebody ----s PP
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