hardtack

noun
UK /ˈhɑːdtæk/
US /ˈhɑːrdtæk/

Hardtack is a hard, dry biscuit that sailors and soldiers ate long ago.

The old sailor kept a piece of hardtack in his pocket for the long voyage.


OTHER MEANINGS

2. A very hard, unsalted bread made from flour and water, baked until dry so it lasts a long time.

The soldiers soaked their hardtack in coffee to make it soft enough to eat.

3. Slang for a tough, stubborn person who does not give up easily.

Grandpa is old hardtack; he never quits a job once he starts it.

4. A plain, basic food that is not fancy but keeps you going.

For breakfast we had hardtack and water before the long hike.