1. burst out, pop out

appear suddenly

Example Sentences:
'Spring popped up everywhere in the valley'

• burst out

2. bug out, bulge, bulge out, come out, pop, pop out, protrude, start

bulge outward

Example Sentences:
'His eyes popped'

• bug out
• bulge
• bulge out
• come out
• pop
• protrude
• start

3. pop out

exit briefly

Example Sentences:
'He popped out for a quick coffee break'

4. pop out

come out suddenly or forcefully

Example Sentences:
'you stick a bill in the vending machine and the change pops out'