1. (verb) increase in extent or intensity

• escalate
• step up

2. (verb) make more intense, stronger, or more marked

• compound
• deepen
• heighten

3. (verb) become more intense

• deepen

1. (verb) increase in extent or intensity

• redouble

2. (verb) make more intense, stronger, or more marked

• amplify
• enhance
• heighten
• raise
• fan
• heat up
• hot up
• screw up
• heighten
• sharpen
• sharpen

3. (verb) become more intense

• accelerate
• quicken
• speed
• speed up
• break open
• burst out
• erupt
• flare
• flare up
• irrupt
• build
• condense
• redouble
• sharpen

1. (verb) increase in extent or intensity

• increase

2. (verb) make more intense, stronger, or more marked

• increase

3. (verb) become more intense

• increase

4. (verb) make the chemically affected part of (a negative) denser or more opaque in order produce a stronger contrast between light and dark

• alter
• change
• modify

1. (verb) make the chemically affected part of (a negative) denser or more opaque in order produce a stronger contrast between light and dark

• photography

1. (verb) increase in extent or intensity

• escalation
• increase
• step-up
• intensification
• intensity
• intensiveness

2. (verb) make more intense, stronger, or more marked

• intensification
• intensifier
• intensive
• intensity
• intensiveness

3. (verb) become more intense

• intensification
• intensity
• intensiveness

4. (verb) make the chemically affected part of (a negative) denser or more opaque in order produce a stronger contrast between light and dark

• chroma
• intensity
• saturation
• vividness
• intensification

1. (verb) increase in extent or intensity

• de-escalate
• step down
• weaken