1. (verb) make more cheerful

• buoy up
• lighten up

2. (verb) become more cheerful

• buoy up
• lighten up

3. (verb) make lighter or brighter

• brighten
• lighten up

4. (verb) become lighter

• lighten up

5. (verb) alleviate or remove (pressure or stress) or make less oppressive

• relieve

1. (verb) make more cheerful

• cheer

2. (verb) reduce the weight on; make lighter

• disburden
• unburden

3. (verb) become more cheerful

• cheer
• cheer up
• chirk up

4. (verb) make lighter or brighter

• alter
• change
• modify

5. (verb) become lighter

• change

6. (verb) alleviate or remove (pressure or stress) or make less oppressive

• mitigate

1. (verb) become lighter

• illume
• illuminate
• illumine
• light
• light up
• irradiate

1. (verb) make more cheerful

• weigh down
• weigh on

2. (verb) make lighter or brighter

• darken

3. (verb) become lighter

• darken