a military aircraft that drops bombs during flight
"The heavy bomber flew silently over the city before dropping its payload of explosives on the target."
a person who plants bombs
"The police suspected that a bomber planted explosives in the subway station last night."
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
"The hungry crowd gathered around the food truck to order a massive sub, locally known as a bomber, piled high with roast beef, melted provolone, crisp lettuce, sliced tomatoes, red onions, and tangy pickle relish."
A military aircraft designed to carry and drop bombs.
"The bomber flew low over the target before releasing its payload of explosives."
In plain English: A bomber is an airplane designed to carry and drop large amounts of explosives on enemy targets from high above.
"The bomber jacket is now a popular fashion item that everyone wears in autumn and winter."
Usage: Avoid using the noun sense when you mean a heavy winter coat; that specific meaning is now obsolete in standard English. Reserve the term for contexts involving military aviation or historical references to early 20th-century aircraft.
Completely solid and secure, usually referring to some form of protective gear.
"His bomber jacket was completely solid and secure against the biting winter wind."
In plain English: Bombers are planes designed to carry and drop large amounts of explosives on targets from high altitudes.
"The bomber jacket is my favorite piece to wear in winter."
The word bomber is formed by adding the suffix "-er" to "bomb," creating a term that originally described someone or something used to drop bombs. This straightforward construction directly reflects its function without requiring complex linguistic history.