1. Something or someone that makes or investigates tunnels
   "He is a member of the engineers, a tunneller who worked on the construction of the London Underground"
   - tunneler [US]

Derived forms: tunnellers

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• breast of lamb
• breast of veal
• breast pocket
• breast-deep
• breast-fed
• breast-high
• breastbone
• breasted
• breastfeed
• breastless
• breastpin
• breastplate
• breaststroke
• breaststroker
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• breath of fresh air
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• breathalyser
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• breathe in