imperil /im-perˈil/ (formal)

To endanger

• dampen
• dampened
• dampening
• dampens
• damper
• dampers
• dampest
• dampier
• dampiest
• damping
• damping-down
• damping-off
• dampings
• dampish
• dampishness
• dampishnesses
• damply
• dampness
• dampnesses
• damp-proof
• damp-proof course
• damp-proof courses
• damp-proofed
• damp-proofing
• damp-proofs