| sub | | |
| n. (food) | 1. bomber, cuban sandwich, grinder, hero, hero sandwich, hoagie, hoagy, 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. |
| ~ sandwich | two (or more) slices of bread with a filling between them. |
| n. (artifact) | 2. pigboat, sub, submarine, u-boat | a submersible warship usually armed with torpedoes. |
| ~ attack submarine | a military submarine designed and armed to attack enemy shipping. |
| ~ auxiliary research submarine | a submarine for research purposes. |
| ~ conning tower | a raised bridge on a submarine; often used for entering and exiting. |
| ~ escape hatch | hatchway that provides a means of escape in an emergency. |
| ~ fleet ballistic missile submarine | a submarine carrying ballistic missiles. |
| ~ nautilus, nuclear-powered submarine, nuclear submarine | a submarine that is propelled by nuclear power. |
| ~ periscope | an optical instrument that provides a view of an otherwise obstructed field. |
| ~ schnorchel, schnorkel, snorkel breather, breather, snorkel | air passage provided by a retractable device containing intake and exhaust pipes; permits a submarine to stay submerged for extended periods of time. |
| ~ asdic, echo sounder, sonar | a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return.; "sonar is an acronym for sound navigation ranging"; "asdic is an acronym for antisubmarine detection investigation committee" |
| ~ submersible warship, submersible | a warship designed to operate under water. |
| v. (possession) | 3. fill in, stand in, sub, substitute | 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" |
| ~ exchange, interchange, change | give to, and receive from, one another.; "Would you change places with me?"; "We have been exchanging letters for a year" |
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