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1. Support and strengthen
   "bolster morale"
   - bolster up
    
2. Prop up with a pillow or bolster
    
3. Add padding to
   - pad

1. A pillow that is often put across a bed underneath the regular pillows
   - long pillow

Derived forms: bolstered, bolstering, bolsters

Type of: fill, fill up, make full, pillow, prop, prop up, reenforce, reinforce, shore, shore up

Encyclopedia: Bolster