headroom

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. vertical space available to allow easy passage under something
• Syn:
headway, clearance
• Hypernyms:
room, way, elbow room
2. the capacity of a system to reproduce loud sounds without distortion
• Syn:
dynamic headroom
• Hypernyms:
high fidelity, hi-fi